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index 06fd7e4..5af50f3 100644
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@@ -1164,6 +1177,8 @@ examples:
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         "404":
           application/json: {"message": "<value>"}
+        "400":
+          application/json: {"message": "<value>"}
   list_members:
     speakeasy-default-list-members:
       parameters:
@@ -1185,6 +1200,8 @@ examples:
           application/json: {"avatar_url": "https://winged-help.net", "created_at": "2024-03-25T14:53:31.200Z", "login": "Rodolfo.Lindgren", "name": "<value>", "updated_at": "2023-12-31T23:08:06.768Z", "url": "https://yummy-colon.org", "bio": "<value>", "company": "Jacobson and Sons", "followers_count": 877273, "following_count": 836968, "location": "<value>", "public_repositories_count": 289203, "title": "<value>", "twitter_username": "<value>"}
         "404":
           application/json: {"message": "<value>"}
+        "400":
+          application/json: {"message": "<value>"}
   apps_api_rest_v0_chapter_list_chapters:
     speakeasy-default-apps-api-rest-v0-chapter-list-chapters:
       parameters:
@@ -1279,6 +1296,8 @@ examples:
           application/json: {"created_at": "2024-10-26T15:58:22.888Z", "key": "<key>", "name": "<value>", "updated_at": "2024-10-23T09:23:37.658Z", "description": "phew regal hoarse what tedious pharmacopoeia stealthily disadvantage emergent at"}
         "404":
           application/json: {"message": "<value>"}
+        "400":
+          application/json: {"message": "<value>"}
   get_organization:
     speakeasy-default-get-organization:
       parameters:
@@ -1289,6 +1308,8 @@ examples:
           application/json: {"created_at": "2025-12-12T04:28:03.547Z", "login": "Alessandra_Beer", "name": "<value>", "updated_at": "2023-07-11T13:29:35.567Z", "company": "Padberg - Hettinger", "location": "<value>"}
         "404":
           application/json: {"message": "<value>"}
+        "400":
+          application/json: {"message": "<value>"}
   get_project:
     speakeasy-default-get-project:
       parameters:
@@ -1299,6 +1320,8 @@ examples:
           application/json: {"created_at": "2023-03-06T09:23:19.829Z", "key": "<key>", "level": "lab", "name": "<value>", "updated_at": "2023-12-06T04:15:58.999Z", "description": "since limply gah consequently ugh petticoat wholly possible", "leaders": []}
         "404":
           application/json: {"message": "<value>"}
+        "400":
+          application/json: {"message": "<value>"}
   list_sponsors:
     speakeasy-default-list-sponsors:
       parameters:
@@ -1320,6 +1343,8 @@ examples:
           application/json: {"image_url": "https://enlightened-hunger.info", "key": "<key>", "name": "<value>", "sponsor_type": "<value>", "url": "https://red-horde.net", "description": "freely blissfully ultimate huzzah instead along sometimes whale asset", "is_member": false, "job_url": "https://every-horde.com", "member_type": "<value>"}
         "404":
           application/json: {"message": "<value>"}
+        "400":
+          application/json: {"message": "<value>"}
   get_event:
     speakeasy-default-get-event:
       parameters:
@@ -1330,6 +1355,8 @@ examples:
           application/json: {"key": "<key>", "name": "<value>", "start_date": "2025-03-27T08:42:01.834Z"}
         "404":
           application/json: {"message": "<value>"}
+        "400":
+          application/json: {"message": "<value>"}
   get_issue:
     speakeasy-default-get-issue:
       parameters:
@@ -1342,6 +1369,8 @@ examples:
           application/json: {"created_at": "2023-01-06T05:13:46.833Z", "state": "closed", "title": "<value>", "updated_at": "2025-07-15T09:16:08.428Z", "url": "https://unaware-intent.net/", "body": "<value>"}
         "404":
           application/json: {"message": "<value>"}
+        "400":
+          application/json: {"message": "<value>"}
   get_release:
     speakeasy-default-get-release:
       parameters:
@@ -1354,6 +1383,8 @@ examples:
           application/json: {"created_at": "2023-02-28T19:12:54.485Z", "name": "<value>", "tag_name": "<value>", "description": "zowie beside endow ah"}
         "404":
           application/json: {"message": "<value>"}
+        "400":
+          application/json: {"message": "<value>"}
   get_repository:
     speakeasy-default-get-repository:
       parameters:
@@ -1365,6 +1396,8 @@ examples:
           application/json: {"created_at": "2023-06-15T20:38:08.250Z", "name": "<value>", "updated_at": "2024-06-04T00:23:47.329Z", "commits_count": 151332, "contributors_count": 474468, "forks_count": 777327, "open_issues_count": 454143, "stars_count": 733383}
         "404":
           application/json: {"message": "<value>"}
+        "400":
+          application/json: {"message": "<value>"}
   list_milestones:
     speakeasy-default-list-milestones:
       parameters:
@@ -1388,6 +1421,8 @@ examples:
           application/json: {"created_at": "2023-09-01T23:58:56.084Z", "number": 88227, "state": "open", "title": "<value>", "updated_at": "2023-09-20T07:01:10.505Z", "url": "https://impressive-configuration.name/", "body": "<value>", "closed_issues_count": 545798, "due_on": "2024-01-25T11:51:50.047Z", "open_issues_count": 564718}
         "404":
           application/json: {"message": "<value>"}
+        "400":
+          application/json: {"message": "<value>"}
   list_snapshots:
     speakeasy-default-list-snapshots:
       parameters:
@@ -1407,6 +1442,8 @@ examples:
           application/json: {"created_at": "2024-04-06T05:40:07.635Z", "end_at": "2025-03-11T07:21:35.938Z", "key": "<key>", "start_at": "2025-08-24T22:14:42.145Z", "title": "<value>", "updated_at": "2025-02-23T14:51:34.958Z", "new_chapters_count": 496225, "new_issues_count": 881483, "new_projects_count": 374148, "new_releases_count": 709291, "new_users_count": 456156}
         "404":
           application/json: {"message": "<value>"}
+        "400":
+          application/json: {"message": "<value>"}
   list_snapshot_chapters:
     speakeasy-default-list-snapshot-chapters:
       parameters:
@@ -1463,10 +1500,7 @@ examples:
         "200":
           application/json: {"current_page": 719171, "has_next": true, "has_previous": false, "items": [], "total_count": 715591, "total_pages": 776129}
 examplesVersion: 1.0.2
-releaseNotes: |
-  ## Python SDK Changes:
-  * `nest.chapters.get_chapter()`:  `response.leaders` **Added**
-  * `nest.projects.get_project()`:  `response.leaders` **Added**
+releaseNotes: "## Python SDK Changes:\n* `nest.events.list_events()`:  `response.items[]` **Changed** (Breaking ⚠️)\n* `nest.events.get_event()`: \n  *  `response` **Changed** (Breaking ⚠️)\n  *  `error.status[400]` **Added**\n* `nest.community.get_organization()`:  `error.status[400]` **Added**\n* `nest.committees.get_committee()`:  `error.status[400]` **Added**\n* `nest.issues.get_issue()`:  `error.status[400]` **Added**\n* `nest.community.get_member()`:  `error.status[400]` **Added**\n* `nest.chapters.get_chapter()`:  `error.status[400]` **Added**\n* `nest.community.get_snapshot()`:  `error.status[400]` **Added**\n* `nest.milestones.get_milestone()`:  `error.status[400]` **Added**\n* `nest.projects.list_projects()`:  `request.q` **Added**\n* `nest.projects.get_project()`:  `error.status[400]` **Added**\n* `nest.releases.get_release()`:  `error.status[400]` **Added**\n* `nest.repositories.get_repository()`:  `error.status[400]` **Added**\n* `nest.sponsors.get_sponsor()`:  `error.status[400]` **Added**\n"
 generatedFiles:
   - .gitattributes
   - .vscode/settings.json
diff --git a/.speakeasy/gen.yaml b/.speakeasy/gen.yaml
index 179d348..7497840 100644
--- a/.speakeasy/gen.yaml
+++ b/.speakeasy/gen.yaml
@@ -13,6 +13,7 @@ generation:
     requestResponseComponentNamesFeb2024: true
     securityFeb2025: true
     sharedErrorComponentsApr2025: true
+    sharedNestedComponentsJan2026: false
   auth:
     oAuth2ClientCredentialsEnabled: false
     oAuth2PasswordEnabled: false
@@ -21,6 +22,7 @@ generation:
   schemas:
     allOfMergeStrategy: shallowMerge
   requestBodyFieldName: ""
+  versioningStrategy: automatic
   persistentEdits: {}
   tests:
     generateTests: false
@@ -30,7 +32,7 @@ generation:
     backoffStrategy: exponential
     maxRetries: 3
 python:
-  version: 0.3.7
+  version: 0.4.0
   additionalDependencies:
     dev: {}
     main: {}
@@ -77,3 +79,4 @@ python:
   responseFormat: flat
   sseFlatResponse: false
   templateVersion: v2
+  useAsyncHooks: false
diff --git a/.speakeasy/workflow.lock b/.speakeasy/workflow.lock
index 8884e37..a3b33cc 100644
--- a/.speakeasy/workflow.lock
+++ b/.speakeasy/workflow.lock
@@ -1,12 +1,12 @@
-speakeasyVersion: 1.680.12
+speakeasyVersion: 1.706.1
 sources:
     nest-openapi:
         sourceNamespace: python-sdk
-        sourceRevisionDigest: sha256:1ec8b5202117c9fab033b9e860db0c29e3a3bc583b8d16f38d0600f994596686
-        sourceBlobDigest: sha256:143881682a7f254e0910541f26427e13242d4cf68f6c5a09e4b07742eaac668f
+        sourceRevisionDigest: sha256:ac60db7c34c5d7d0165c8b04d171166325eae3f0c93ef5e02471550a2fe70aa6
+        sourceBlobDigest: sha256:9a16c6178e04db6291b58f83fac8ec5dcce22793c8862125c67b83bb60bbd576
         tags:
             - latest
-            - speakeasy-sdk-regen-1767573730
+            - speakeasy-sdk-regen-1769388120
             - 0.3.6
 targets:
     nest-api:
@@ -19,10 +19,10 @@ targets:
     nest-sdk-python:
         source: nest-openapi
         sourceNamespace: python-sdk
-        sourceRevisionDigest: sha256:1ec8b5202117c9fab033b9e860db0c29e3a3bc583b8d16f38d0600f994596686
-        sourceBlobDigest: sha256:143881682a7f254e0910541f26427e13242d4cf68f6c5a09e4b07742eaac668f
+        sourceRevisionDigest: sha256:ac60db7c34c5d7d0165c8b04d171166325eae3f0c93ef5e02471550a2fe70aa6
+        sourceBlobDigest: sha256:9a16c6178e04db6291b58f83fac8ec5dcce22793c8862125c67b83bb60bbd576
         codeSamplesNamespace: python-code-samples
-        codeSamplesRevisionDigest: sha256:7fd55e0ebc1e8b2270743b5aa79d8ebee70911bb284f477ee405403ca4650add
+        codeSamplesRevisionDigest: sha256:4ca09ab3e3248399bfa86972282727a9f10e9c9804697ed51215142ba34414c8
 workflow:
     workflowVersion: 1.0.0
     speakeasyVersion: latest
diff --git a/README-PYPI.md b/README-PYPI.md
index a44f168..e565591 100644
--- a/README-PYPI.md
+++ b/README-PYPI.md
@@ -83,7 +83,7 @@ It's also possible to write a standalone Python script without needing to set up
 ```python
 #!/usr/bin/env -S uv run --script
 # /// script
-# requires-python = ">=3.9"
+# requires-python = ">=3.10"
 # dependencies = [
 #     "owasp-nest",
 # ]
@@ -310,6 +310,7 @@ with Nest(
 
 ### Example
 ```python
+import owasp_nest
 from owasp_nest import Nest, models
 
 
@@ -334,15 +335,16 @@ with Nest(
         print(e.raw_response)
 
         # Depending on the method different errors may be thrown
-        if isinstance(e, models.ChapterError):
+        if isinstance(e, models.ValidationErrorSchema):
             print(e.data.message)  # str
+            print(e.data.errors)  # OptionalNullable[owasp_nest.Errors]
 ```
 
 ### Error Classes
 **Primary error:**
 * [`NestError`](https://github.com/OWASP/nest-sdk-python/blob/master/./src/owasp_nest/models/nesterror.py): The base class for HTTP error responses.
 
-<details><summary>Less common errors (17)</summary>
+<details><summary>Less common errors (18)</summary>
 
 <br />
 
@@ -353,6 +355,7 @@ with Nest(
 
 
 **Inherit from [`NestError`](https://github.com/OWASP/nest-sdk-python/blob/master/./src/owasp_nest/models/nesterror.py)**:
+* [`ValidationErrorSchema`](https://github.com/OWASP/nest-sdk-python/blob/master/./src/owasp_nest/models/validationerrorschema.py): Schema for validation error. Status code `400`. Applicable to 12 of 29 methods.*
 * [`ChapterError`](https://github.com/OWASP/nest-sdk-python/blob/master/./src/owasp_nest/models/chaptererror.py): Chapter error schema. Status code `404`. Applicable to 1 of 29 methods.*
 * [`CommitteeError`](https://github.com/OWASP/nest-sdk-python/blob/master/./src/owasp_nest/models/committeeerror.py): Committee error schema. Status code `404`. Applicable to 1 of 29 methods.*
 * [`EventError`](https://github.com/OWASP/nest-sdk-python/blob/master/./src/owasp_nest/models/eventerror.py): Event error schema. Status code `404`. Applicable to 1 of 29 methods.*
diff --git a/README.md b/README.md
index b480b2f..f395287 100644
--- a/README.md
+++ b/README.md
@@ -83,7 +83,7 @@ It's also possible to write a standalone Python script without needing to set up
 ```python
 #!/usr/bin/env -S uv run --script
 # /// script
-# requires-python = ">=3.9"
+# requires-python = ">=3.10"
 # dependencies = [
 #     "owasp-nest",
 # ]
@@ -310,6 +310,7 @@ with Nest(
 
 ### Example
 ```python
+import owasp_nest
 from owasp_nest import Nest, models
 
 
@@ -334,15 +335,16 @@ with Nest(
         print(e.raw_response)
 
         # Depending on the method different errors may be thrown
-        if isinstance(e, models.ChapterError):
+        if isinstance(e, models.ValidationErrorSchema):
             print(e.data.message)  # str
+            print(e.data.errors)  # OptionalNullable[owasp_nest.Errors]
 ```
 
 ### Error Classes
 **Primary error:**
 * [`NestError`](./src/owasp_nest/models/nesterror.py): The base class for HTTP error responses.
 
-<details><summary>Less common errors (17)</summary>
+<details><summary>Less common errors (18)</summary>
 
 <br />
 
@@ -353,6 +355,7 @@ with Nest(
 
 
 **Inherit from [`NestError`](./src/owasp_nest/models/nesterror.py)**:
+* [`ValidationErrorSchema`](./src/owasp_nest/models/validationerrorschema.py): Schema for validation error. Status code `400`. Applicable to 12 of 29 methods.*
 * [`ChapterError`](./src/owasp_nest/models/chaptererror.py): Chapter error schema. Status code `404`. Applicable to 1 of 29 methods.*
 * [`CommitteeError`](./src/owasp_nest/models/committeeerror.py): Committee error schema. Status code `404`. Applicable to 1 of 29 methods.*
 * [`EventError`](./src/owasp_nest/models/eventerror.py): Event error schema. Status code `404`. Applicable to 1 of 29 methods.*
diff --git a/RELEASES.md b/RELEASES.md
index 0bdb2aa..7c048b6 100644
--- a/RELEASES.md
+++ b/RELEASES.md
@@ -146,4 +146,14 @@ Based on:
 ### Generated
 - [python v0.3.7] .
 ### Releases
-- [PyPI v0.3.7] https://pypi.org/project/owasp-nest/0.3.7 - .
\ No newline at end of file
+- [PyPI v0.3.7] https://pypi.org/project/owasp-nest/0.3.7 - .
+
+## 2026-02-06 00:43:25
+### Changes
+Based on:
+- OpenAPI Doc  
+- Speakeasy CLI 1.706.1 (2.809.2) https://github.com/speakeasy-api/speakeasy
+### Generated
+- [python v0.4.0] .
+### Releases
+- [PyPI v0.4.0] https://pypi.org/project/owasp-nest/0.4.0 - .
\ No newline at end of file
diff --git a/docs/models/errors.md b/docs/models/errors.md
new file mode 100644
index 0000000..fc1e63c
--- /dev/null
+++ b/docs/models/errors.md
@@ -0,0 +1,17 @@
+# Errors
+
+
+## Supported Types
+
+### `List[Dict[str, Any]]`
+
+```python
+value: List[Dict[str, Any]] = /* values here */
+```
+
+### `Dict[str, Any]`
+
+```python
+value: Dict[str, Any] = /* values here */
+```
+
diff --git a/docs/models/event.md b/docs/models/event.md
index bdcc811..75d4000 100644
--- a/docs/models/event.md
+++ b/docs/models/event.md
@@ -5,12 +5,12 @@ Schema for Event (minimal fields for list display).
 
 ## Fields
 
-| Field                                                                | Type                                                                 | Required                                                             | Description                                                          |
-| -------------------------------------------------------------------- | -------------------------------------------------------------------- | -------------------------------------------------------------------- | -------------------------------------------------------------------- |
-| `end_date`                                                           | [date](https://docs.python.org/3/library/datetime.html#date-objects) | :heavy_minus_sign:                                                   | N/A                                                                  |
-| `key`                                                                | *str*                                                                | :heavy_check_mark:                                                   | N/A                                                                  |
-| `latitude`                                                           | *OptionalNullable[float]*                                            | :heavy_minus_sign:                                                   | N/A                                                                  |
-| `longitude`                                                          | *OptionalNullable[float]*                                            | :heavy_minus_sign:                                                   | N/A                                                                  |
-| `name`                                                               | *str*                                                                | :heavy_check_mark:                                                   | N/A                                                                  |
-| `start_date`                                                         | [date](https://docs.python.org/3/library/datetime.html#date-objects) | :heavy_check_mark:                                                   | N/A                                                                  |
-| `url`                                                                | *OptionalNullable[str]*                                              | :heavy_minus_sign:                                                   | N/A                                                                  |
\ No newline at end of file
+| Field                     | Type                      | Required                  | Description               |
+| ------------------------- | ------------------------- | ------------------------- | ------------------------- |
+| `end_date`                | *OptionalNullable[str]*   | :heavy_minus_sign:        | N/A                       |
+| `key`                     | *str*                     | :heavy_check_mark:        | N/A                       |
+| `latitude`                | *OptionalNullable[float]* | :heavy_minus_sign:        | N/A                       |
+| `longitude`               | *OptionalNullable[float]* | :heavy_minus_sign:        | N/A                       |
+| `name`                    | *str*                     | :heavy_check_mark:        | N/A                       |
+| `start_date`              | *str*                     | :heavy_check_mark:        | N/A                       |
+| `url`                     | *OptionalNullable[str]*   | :heavy_minus_sign:        | N/A                       |
\ No newline at end of file
diff --git a/docs/models/eventdetail.md b/docs/models/eventdetail.md
index e31b052..40f502a 100644
--- a/docs/models/eventdetail.md
+++ b/docs/models/eventdetail.md
@@ -5,13 +5,13 @@ Detail schema for Event (used in single item endpoints).
 
 ## Fields
 
-| Field                                                                | Type                                                                 | Required                                                             | Description                                                          |
-| -------------------------------------------------------------------- | -------------------------------------------------------------------- | -------------------------------------------------------------------- | -------------------------------------------------------------------- |
-| `end_date`                                                           | [date](https://docs.python.org/3/library/datetime.html#date-objects) | :heavy_minus_sign:                                                   | N/A                                                                  |
-| `key`                                                                | *str*                                                                | :heavy_check_mark:                                                   | N/A                                                                  |
-| `latitude`                                                           | *OptionalNullable[float]*                                            | :heavy_minus_sign:                                                   | N/A                                                                  |
-| `longitude`                                                          | *OptionalNullable[float]*                                            | :heavy_minus_sign:                                                   | N/A                                                                  |
-| `name`                                                               | *str*                                                                | :heavy_check_mark:                                                   | N/A                                                                  |
-| `start_date`                                                         | [date](https://docs.python.org/3/library/datetime.html#date-objects) | :heavy_check_mark:                                                   | N/A                                                                  |
-| `url`                                                                | *OptionalNullable[str]*                                              | :heavy_minus_sign:                                                   | N/A                                                                  |
-| `description`                                                        | *OptionalNullable[str]*                                              | :heavy_minus_sign:                                                   | N/A                                                                  |
\ No newline at end of file
+| Field                     | Type                      | Required                  | Description               |
+| ------------------------- | ------------------------- | ------------------------- | ------------------------- |
+| `end_date`                | *OptionalNullable[str]*   | :heavy_minus_sign:        | N/A                       |
+| `key`                     | *str*                     | :heavy_check_mark:        | N/A                       |
+| `latitude`                | *OptionalNullable[float]* | :heavy_minus_sign:        | N/A                       |
+| `longitude`               | *OptionalNullable[float]* | :heavy_minus_sign:        | N/A                       |
+| `name`                    | *str*                     | :heavy_check_mark:        | N/A                       |
+| `start_date`              | *str*                     | :heavy_check_mark:        | N/A                       |
+| `url`                     | *OptionalNullable[str]*   | :heavy_minus_sign:        | N/A                       |
+| `description`             | *OptionalNullable[str]*   | :heavy_minus_sign:        | N/A                       |
\ No newline at end of file
diff --git a/docs/models/listprojectsrequest.md b/docs/models/listprojectsrequest.md
index c0bcfce..bfc0830 100644
--- a/docs/models/listprojectsrequest.md
+++ b/docs/models/listprojectsrequest.md
@@ -6,6 +6,7 @@
 | Field                                                                              | Type                                                                               | Required                                                                           | Description                                                                        |
 | ---------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------- |
 | `level`                                                                            | [OptionalNullable[models.ProjectLevel]](../models/projectlevel.md)                 | :heavy_minus_sign:                                                                 | Level of the project                                                               |
+| `q`                                                                                | *OptionalNullable[str]*                                                            | :heavy_minus_sign:                                                                 | Structured search query (e.g. 'name:security stars:>100')                          |
 | `ordering`                                                                         | [OptionalNullable[models.ListProjectsOrdering]](../models/listprojectsordering.md) | :heavy_minus_sign:                                                                 | Ordering field                                                                     |
 | `page`                                                                             | *Optional[int]*                                                                    | :heavy_minus_sign:                                                                 | Page number                                                                        |
 | `page_size`                                                                        | *Optional[int]*                                                                    | :heavy_minus_sign:                                                                 | Number of items per page                                                           |
\ No newline at end of file
diff --git a/docs/models/validationerrorschema.md b/docs/models/validationerrorschema.md
new file mode 100644
index 0000000..3ad353d
--- /dev/null
+++ b/docs/models/validationerrorschema.md
@@ -0,0 +1,11 @@
+# ValidationErrorSchema
+
+Schema for validation error.
+
+
+## Fields
+
+| Field                                                  | Type                                                   | Required                                               | Description                                            |
+| ------------------------------------------------------ | ------------------------------------------------------ | ------------------------------------------------------ | ------------------------------------------------------ |
+| `message`                                              | *str*                                                  | :heavy_check_mark:                                     | N/A                                                    |
+| `errors`                                               | [OptionalNullable[models.Errors]](../models/errors.md) | :heavy_minus_sign:                                     | N/A                                                    |
\ No newline at end of file
diff --git a/docs/sdks/chapters/README.md b/docs/sdks/chapters/README.md
index 75f0ff1..ab778c6 100644
--- a/docs/sdks/chapters/README.md
+++ b/docs/sdks/chapters/README.md
@@ -88,7 +88,8 @@ with Nest(
 
 ### Errors
 
-| Error Type          | Status Code         | Content Type        |
-| ------------------- | ------------------- | ------------------- |
-| models.ChapterError | 404                 | application/json    |
-| models.NestAPIError | 4XX, 5XX            | \*/\*               |
\ No newline at end of file
+| Error Type                   | Status Code                  | Content Type                 |
+| ---------------------------- | ---------------------------- | ---------------------------- |
+| models.ValidationErrorSchema | 400                          | application/json             |
+| models.ChapterError          | 404                          | application/json             |
+| models.NestAPIError          | 4XX, 5XX                     | \*/\*                        |
\ No newline at end of file
diff --git a/docs/sdks/committees/README.md b/docs/sdks/committees/README.md
index 86e7763..03c6a98 100644
--- a/docs/sdks/committees/README.md
+++ b/docs/sdks/committees/README.md
@@ -83,7 +83,8 @@ with Nest(
 
 ### Errors
 
-| Error Type            | Status Code           | Content Type          |
-| --------------------- | --------------------- | --------------------- |
-| models.CommitteeError | 404                   | application/json      |
-| models.NestAPIError   | 4XX, 5XX              | \*/\*                 |
\ No newline at end of file
+| Error Type                   | Status Code                  | Content Type                 |
+| ---------------------------- | ---------------------------- | ---------------------------- |
+| models.ValidationErrorSchema | 400                          | application/json             |
+| models.CommitteeError        | 404                          | application/json             |
+| models.NestAPIError          | 4XX, 5XX                     | \*/\*                        |
\ No newline at end of file
diff --git a/docs/sdks/community/README.md b/docs/sdks/community/README.md
index 83e475a..a293e07 100644
--- a/docs/sdks/community/README.md
+++ b/docs/sdks/community/README.md
@@ -94,10 +94,11 @@ with Nest(
 
 ### Errors
 
-| Error Type          | Status Code         | Content Type        |
-| ------------------- | ------------------- | ------------------- |
-| models.MemberError  | 404                 | application/json    |
-| models.NestAPIError | 4XX, 5XX            | \*/\*               |
+| Error Type                   | Status Code                  | Content Type                 |
+| ---------------------------- | ---------------------------- | ---------------------------- |
+| models.ValidationErrorSchema | 400                          | application/json             |
+| models.MemberError           | 404                          | application/json             |
+| models.NestAPIError          | 4XX, 5XX                     | \*/\*                        |
 
 ## list_organizations
 
@@ -176,10 +177,11 @@ with Nest(
 
 ### Errors
 
-| Error Type               | Status Code              | Content Type             |
-| ------------------------ | ------------------------ | ------------------------ |
-| models.OrganizationError | 404                      | application/json         |
-| models.NestAPIError      | 4XX, 5XX                 | \*/\*                    |
+| Error Type                   | Status Code                  | Content Type                 |
+| ---------------------------- | ---------------------------- | ---------------------------- |
+| models.ValidationErrorSchema | 400                          | application/json             |
+| models.OrganizationError     | 404                          | application/json             |
+| models.NestAPIError          | 4XX, 5XX                     | \*/\*                        |
 
 ## list_snapshots
 
@@ -257,10 +259,11 @@ with Nest(
 
 ### Errors
 
-| Error Type           | Status Code          | Content Type         |
-| -------------------- | -------------------- | -------------------- |
-| models.SnapshotError | 404                  | application/json     |
-| models.NestAPIError  | 4XX, 5XX             | \*/\*                |
+| Error Type                   | Status Code                  | Content Type                 |
+| ---------------------------- | ---------------------------- | ---------------------------- |
+| models.ValidationErrorSchema | 400                          | application/json             |
+| models.SnapshotError         | 404                          | application/json             |
+| models.NestAPIError          | 4XX, 5XX                     | \*/\*                        |
 
 ## list_snapshot_chapters
 
diff --git a/docs/sdks/events/README.md b/docs/sdks/events/README.md
index 40d919b..6abab19 100644
--- a/docs/sdks/events/README.md
+++ b/docs/sdks/events/README.md
@@ -88,7 +88,8 @@ with Nest(
 
 ### Errors
 
-| Error Type          | Status Code         | Content Type        |
-| ------------------- | ------------------- | ------------------- |
-| models.EventError   | 404                 | application/json    |
-| models.NestAPIError | 4XX, 5XX            | \*/\*               |
\ No newline at end of file
+| Error Type                   | Status Code                  | Content Type                 |
+| ---------------------------- | ---------------------------- | ---------------------------- |
+| models.ValidationErrorSchema | 400                          | application/json             |
+| models.EventError            | 404                          | application/json             |
+| models.NestAPIError          | 4XX, 5XX                     | \*/\*                        |
\ No newline at end of file
diff --git a/docs/sdks/issues/README.md b/docs/sdks/issues/README.md
index 6bed211..7a27723 100644
--- a/docs/sdks/issues/README.md
+++ b/docs/sdks/issues/README.md
@@ -88,7 +88,8 @@ with Nest(
 
 ### Errors
 
-| Error Type          | Status Code         | Content Type        |
-| ------------------- | ------------------- | ------------------- |
-| models.IssueError   | 404                 | application/json    |
-| models.NestAPIError | 4XX, 5XX            | \*/\*               |
\ No newline at end of file
+| Error Type                   | Status Code                  | Content Type                 |
+| ---------------------------- | ---------------------------- | ---------------------------- |
+| models.ValidationErrorSchema | 400                          | application/json             |
+| models.IssueError            | 404                          | application/json             |
+| models.NestAPIError          | 4XX, 5XX                     | \*/\*                        |
\ No newline at end of file
diff --git a/docs/sdks/milestones/README.md b/docs/sdks/milestones/README.md
index d1ca109..79eb897 100644
--- a/docs/sdks/milestones/README.md
+++ b/docs/sdks/milestones/README.md
@@ -88,7 +88,8 @@ with Nest(
 
 ### Errors
 
-| Error Type            | Status Code           | Content Type          |
-| --------------------- | --------------------- | --------------------- |
-| models.MilestoneError | 404                   | application/json      |
-| models.NestAPIError   | 4XX, 5XX              | \*/\*                 |
\ No newline at end of file
+| Error Type                   | Status Code                  | Content Type                 |
+| ---------------------------- | ---------------------------- | ---------------------------- |
+| models.ValidationErrorSchema | 400                          | application/json             |
+| models.MilestoneError        | 404                          | application/json             |
+| models.NestAPIError          | 4XX, 5XX                     | \*/\*                        |
\ No newline at end of file
diff --git a/docs/sdks/projects/README.md b/docs/sdks/projects/README.md
index be9aa1d..892ad31 100644
--- a/docs/sdks/projects/README.md
+++ b/docs/sdks/projects/README.md
@@ -35,6 +35,7 @@ with Nest(
 | Parameter                                                                             | Type                                                                                  | Required                                                                              | Description                                                                           |
 | ------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------- |
 | `level`                                                                               | [OptionalNullable[models.ProjectLevel]](../../models/projectlevel.md)                 | :heavy_minus_sign:                                                                    | Level of the project                                                                  |
+| `q`                                                                                   | *OptionalNullable[str]*                                                               | :heavy_minus_sign:                                                                    | Structured search query (e.g. 'name:security stars:>100')                             |
 | `ordering`                                                                            | [OptionalNullable[models.ListProjectsOrdering]](../../models/listprojectsordering.md) | :heavy_minus_sign:                                                                    | Ordering field                                                                        |
 | `page`                                                                                | *Optional[int]*                                                                       | :heavy_minus_sign:                                                                    | Page number                                                                           |
 | `page_size`                                                                           | *Optional[int]*                                                                       | :heavy_minus_sign:                                                                    | Number of items per page                                                              |
@@ -85,7 +86,8 @@ with Nest(
 
 ### Errors
 
-| Error Type          | Status Code         | Content Type        |
-| ------------------- | ------------------- | ------------------- |
-| models.ProjectError | 404                 | application/json    |
-| models.NestAPIError | 4XX, 5XX            | \*/\*               |
\ No newline at end of file
+| Error Type                   | Status Code                  | Content Type                 |
+| ---------------------------- | ---------------------------- | ---------------------------- |
+| models.ValidationErrorSchema | 400                          | application/json             |
+| models.ProjectError          | 404                          | application/json             |
+| models.NestAPIError          | 4XX, 5XX                     | \*/\*                        |
\ No newline at end of file
diff --git a/docs/sdks/releases/README.md b/docs/sdks/releases/README.md
index 6776572..e5995cc 100644
--- a/docs/sdks/releases/README.md
+++ b/docs/sdks/releases/README.md
@@ -88,7 +88,8 @@ with Nest(
 
 ### Errors
 
-| Error Type          | Status Code         | Content Type        |
-| ------------------- | ------------------- | ------------------- |
-| models.ReleaseError | 404                 | application/json    |
-| models.NestAPIError | 4XX, 5XX            | \*/\*               |
\ No newline at end of file
+| Error Type                   | Status Code                  | Content Type                 |
+| ---------------------------- | ---------------------------- | ---------------------------- |
+| models.ValidationErrorSchema | 400                          | application/json             |
+| models.ReleaseError          | 404                          | application/json             |
+| models.NestAPIError          | 4XX, 5XX                     | \*/\*                        |
\ No newline at end of file
diff --git a/docs/sdks/repositories/README.md b/docs/sdks/repositories/README.md
index d18def6..d3cdb2d 100644
--- a/docs/sdks/repositories/README.md
+++ b/docs/sdks/repositories/README.md
@@ -85,7 +85,8 @@ with Nest(
 
 ### Errors
 
-| Error Type             | Status Code            | Content Type           |
-| ---------------------- | ---------------------- | ---------------------- |
-| models.RepositoryError | 404                    | application/json       |
-| models.NestAPIError    | 4XX, 5XX               | \*/\*                  |
\ No newline at end of file
+| Error Type                   | Status Code                  | Content Type                 |
+| ---------------------------- | ---------------------------- | ---------------------------- |
+| models.ValidationErrorSchema | 400                          | application/json             |
+| models.RepositoryError       | 404                          | application/json             |
+| models.NestAPIError          | 4XX, 5XX                     | \*/\*                        |
\ No newline at end of file
diff --git a/docs/sdks/sponsors/README.md b/docs/sdks/sponsors/README.md
index a3c0bfc..334976d 100644
--- a/docs/sdks/sponsors/README.md
+++ b/docs/sdks/sponsors/README.md
@@ -86,7 +86,8 @@ with Nest(
 
 ### Errors
 
-| Error Type          | Status Code         | Content Type        |
-| ------------------- | ------------------- | ------------------- |
-| models.SponsorError | 404                 | application/json    |
-| models.NestAPIError | 4XX, 5XX            | \*/\*               |
\ No newline at end of file
+| Error Type                   | Status Code                  | Content Type                 |
+| ---------------------------- | ---------------------------- | ---------------------------- |
+| models.ValidationErrorSchema | 400                          | application/json             |
+| models.SponsorError          | 404                          | application/json             |
+| models.NestAPIError          | 4XX, 5XX                     | \*/\*                        |
\ No newline at end of file
diff --git a/pylintrc b/pylintrc
index 7f1dd32..2dc74cb 100644
--- a/pylintrc
+++ b/pylintrc
@@ -89,7 +89,7 @@ persistent=yes
 
 # Minimum Python version to use for version dependent checks. Will default to
 # the version used to run pylint.
-py-version=3.9
+py-version=3.10
 
 # Discover python modules and packages in the file system subtree.
 recursive=no
@@ -187,7 +187,8 @@ good-names=i,
            ex,
            Run,
            _,
-           e
+           e,
+           q
 
 # Good variable names regexes, separated by a comma. If names match any regex,
 # they will always be accepted
diff --git a/pyproject.toml b/pyproject.toml
index 448a509..08d2eab 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,10 +1,10 @@
 [project]
 name = "owasp-nest"
-version = "0.3.7"
+version = "0.4.0"
 description = "OWASP Nest Python SDK"
 authors = [{ name = "Arkadii Yakovets" },]
 readme = "README-PYPI.md"
-requires-python = ">=3.9.2"
+requires-python = ">=3.10"
 dependencies = [
     "httpcore >=1.0.9",
     "httpx >=0.28.1",
diff --git a/src/owasp_nest/_version.py b/src/owasp_nest/_version.py
index 0052f63..eb92b10 100644
--- a/src/owasp_nest/_version.py
+++ b/src/owasp_nest/_version.py
@@ -3,10 +3,10 @@
 import importlib.metadata
 
 __title__: str = "owasp-nest"
-__version__: str = "0.3.7"
+__version__: str = "0.4.0"
 __openapi_doc_version__: str = "0.3.6"
-__gen_version__: str = "2.788.15"
-__user_agent__: str = "speakeasy-sdk/python 0.3.7 2.788.15 0.3.6 owasp-nest"
+__gen_version__: str = "2.809.2"
+__user_agent__: str = "speakeasy-sdk/python 0.4.0 2.809.2 0.3.6 owasp-nest"
 
 try:
     if __package__ is not None:
diff --git a/src/owasp_nest/basesdk.py b/src/owasp_nest/basesdk.py
index 65969ec..7367bab 100644
--- a/src/owasp_nest/basesdk.py
+++ b/src/owasp_nest/basesdk.py
@@ -8,7 +8,12 @@
     AfterSuccessContext,
     BeforeRequestContext,
 )
-from owasp_nest.utils import RetryConfig, SerializedRequestBody, get_body_content
+from owasp_nest.utils import (
+    RetryConfig,
+    SerializedRequestBody,
+    get_body_content,
+    run_sync_in_thread,
+)
 from typing import Callable, List, Mapping, Optional, Tuple
 from urllib.parse import parse_qs, urlparse
 
@@ -311,7 +316,10 @@ async def do_request_async(
         async def do():
             http_res = None
             try:
-                req = hooks.before_request(BeforeRequestContext(hook_ctx), request)
+                req = await run_sync_in_thread(
+                    hooks.before_request, BeforeRequestContext(hook_ctx), request
+                )
+
                 logger.debug(
                     "Request:\nMethod: %s\nURL: %s\nHeaders: %s\nBody: %s",
                     req.method,
@@ -325,7 +333,10 @@ async def do():
 
                 http_res = await client.send(req, stream=stream)
             except Exception as e:
-                _, e = hooks.after_error(AfterErrorContext(hook_ctx), None, e)
+                _, e = await run_sync_in_thread(
+                    hooks.after_error, AfterErrorContext(hook_ctx), None, e
+                )
+
                 if e is not None:
                     logger.debug("Request Exception", exc_info=True)
                     raise e
@@ -343,9 +354,10 @@ async def do():
             )
 
             if utils.match_status_codes(error_status_codes, http_res.status_code):
-                result, err = hooks.after_error(
-                    AfterErrorContext(hook_ctx), http_res, None
+                result, err = await run_sync_in_thread(
+                    hooks.after_error, AfterErrorContext(hook_ctx), http_res, None
                 )
+
                 if err is not None:
                     logger.debug("Request Exception", exc_info=True)
                     raise err
@@ -365,6 +377,8 @@ async def do():
             http_res = await do()
 
         if not utils.match_status_codes(error_status_codes, http_res.status_code):
-            http_res = hooks.after_success(AfterSuccessContext(hook_ctx), http_res)
+            http_res = await run_sync_in_thread(
+                hooks.after_success, AfterSuccessContext(hook_ctx), http_res
+            )
 
         return http_res
diff --git a/src/owasp_nest/chapters.py b/src/owasp_nest/chapters.py
index f89cdae..1cd1216 100644
--- a/src/owasp_nest/chapters.py
+++ b/src/owasp_nest/chapters.py
@@ -282,13 +282,18 @@ def get_chapter(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.ChapterDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(models.ChapterErrorData, http_res)
             raise models.ChapterError(response_data, http_res)
@@ -368,13 +373,18 @@ async def get_chapter_async(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.ChapterDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(models.ChapterErrorData, http_res)
             raise models.ChapterError(response_data, http_res)
diff --git a/src/owasp_nest/committees.py b/src/owasp_nest/committees.py
index 341b5f6..c878502 100644
--- a/src/owasp_nest/committees.py
+++ b/src/owasp_nest/committees.py
@@ -252,13 +252,18 @@ def get_committee(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.CommitteeDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(models.CommitteeErrorData, http_res)
             raise models.CommitteeError(response_data, http_res)
@@ -338,13 +343,18 @@ async def get_committee_async(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.CommitteeDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(models.CommitteeErrorData, http_res)
             raise models.CommitteeError(response_data, http_res)
diff --git a/src/owasp_nest/community.py b/src/owasp_nest/community.py
index 459b5b7..46c7407 100644
--- a/src/owasp_nest/community.py
+++ b/src/owasp_nest/community.py
@@ -264,13 +264,18 @@ def get_member(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.MemberDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(models.MemberErrorData, http_res)
             raise models.MemberError(response_data, http_res)
@@ -350,13 +355,18 @@ async def get_member_async(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.MemberDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(models.MemberErrorData, http_res)
             raise models.MemberError(response_data, http_res)
@@ -618,13 +628,18 @@ def get_organization(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.OrganizationDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(
                 models.OrganizationErrorData, http_res
@@ -706,13 +721,18 @@ async def get_organization_async(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.OrganizationDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(
                 models.OrganizationErrorData, http_res
@@ -970,13 +990,18 @@ def get_snapshot(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.SnapshotDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(models.SnapshotErrorData, http_res)
             raise models.SnapshotError(response_data, http_res)
@@ -1056,13 +1081,18 @@ async def get_snapshot_async(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.SnapshotDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(models.SnapshotErrorData, http_res)
             raise models.SnapshotError(response_data, http_res)
diff --git a/src/owasp_nest/events.py b/src/owasp_nest/events.py
index b2081f2..0486371 100644
--- a/src/owasp_nest/events.py
+++ b/src/owasp_nest/events.py
@@ -282,13 +282,18 @@ def get_event(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.EventDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(models.EventErrorData, http_res)
             raise models.EventError(response_data, http_res)
@@ -368,13 +373,18 @@ async def get_event_async(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.EventDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(models.EventErrorData, http_res)
             raise models.EventError(response_data, http_res)
diff --git a/src/owasp_nest/issues.py b/src/owasp_nest/issues.py
index f2ad9e1..c86e7a1 100644
--- a/src/owasp_nest/issues.py
+++ b/src/owasp_nest/issues.py
@@ -276,13 +276,18 @@ def get_issue(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.IssueDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(models.IssueErrorData, http_res)
             raise models.IssueError(response_data, http_res)
@@ -368,13 +373,18 @@ async def get_issue_async(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.IssueDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(models.IssueErrorData, http_res)
             raise models.IssueError(response_data, http_res)
diff --git a/src/owasp_nest/milestones.py b/src/owasp_nest/milestones.py
index c448fad..c8d1725 100644
--- a/src/owasp_nest/milestones.py
+++ b/src/owasp_nest/milestones.py
@@ -276,13 +276,18 @@ def get_milestone(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.MilestoneDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(models.MilestoneErrorData, http_res)
             raise models.MilestoneError(response_data, http_res)
@@ -368,13 +373,18 @@ async def get_milestone_async(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.MilestoneDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(models.MilestoneErrorData, http_res)
             raise models.MilestoneError(response_data, http_res)
diff --git a/src/owasp_nest/models/__init__.py b/src/owasp_nest/models/__init__.py
index a01eaf4..7884bb3 100644
--- a/src/owasp_nest/models/__init__.py
+++ b/src/owasp_nest/models/__init__.py
@@ -170,6 +170,12 @@
     from .sponsordetail import SponsorDetail, SponsorDetailTypedDict
     from .sponsorerror import SponsorError, SponsorErrorData
     from .state import State
+    from .validationerrorschema import (
+        Errors,
+        ErrorsTypedDict,
+        ValidationErrorSchema,
+        ValidationErrorSchemaData,
+    )
 
 __all__ = [
     "Chapter",
@@ -184,6 +190,8 @@
     "CommitteeError",
     "CommitteeErrorData",
     "CommitteeTypedDict",
+    "Errors",
+    "ErrorsTypedDict",
     "Event",
     "EventDetail",
     "EventDetailTypedDict",
@@ -362,6 +370,8 @@
     "SponsorErrorData",
     "SponsorTypedDict",
     "State",
+    "ValidationErrorSchema",
+    "ValidationErrorSchemaData",
 ]
 
 _dynamic_imports: dict[str, str] = {
@@ -554,6 +564,10 @@
     "SponsorError": ".sponsorerror",
     "SponsorErrorData": ".sponsorerror",
     "State": ".state",
+    "Errors": ".validationerrorschema",
+    "ErrorsTypedDict": ".validationerrorschema",
+    "ValidationErrorSchema": ".validationerrorschema",
+    "ValidationErrorSchemaData": ".validationerrorschema",
 }
 
 
diff --git a/src/owasp_nest/models/chapter.py b/src/owasp_nest/models/chapter.py
index ee2af8d..32eea35 100644
--- a/src/owasp_nest/models/chapter.py
+++ b/src/owasp_nest/models/chapter.py
@@ -41,30 +41,25 @@ class Chapter(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = ["latitude", "longitude"]
-        nullable_fields = ["latitude", "longitude"]
-        null_default_fields = []
-
+        optional_fields = set(["latitude", "longitude"])
+        nullable_fields = set(["latitude", "longitude"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/chapterdetail.py b/src/owasp_nest/models/chapterdetail.py
index 0f5773f..697013a 100644
--- a/src/owasp_nest/models/chapterdetail.py
+++ b/src/owasp_nest/models/chapterdetail.py
@@ -52,30 +52,25 @@ class ChapterDetail(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = ["latitude", "longitude"]
-        nullable_fields = ["latitude", "longitude"]
-        null_default_fields = []
-
+        optional_fields = set(["latitude", "longitude"])
+        nullable_fields = set(["latitude", "longitude"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/event.py b/src/owasp_nest/models/event.py
index 25a63af..dc0159a 100644
--- a/src/owasp_nest/models/event.py
+++ b/src/owasp_nest/models/event.py
@@ -1,7 +1,6 @@
 """Code generated by Speakeasy (https://speakeasy.com). DO NOT EDIT."""
 
 from __future__ import annotations
-from datetime import datetime
 from owasp_nest.types import (
     BaseModel,
     Nullable,
@@ -18,8 +17,8 @@ class EventTypedDict(TypedDict):
 
     key: str
     name: str
-    start_date: datetime
-    end_date: NotRequired[Nullable[datetime]]
+    start_date: str
+    end_date: NotRequired[Nullable[str]]
     latitude: NotRequired[Nullable[float]]
     longitude: NotRequired[Nullable[float]]
     url: NotRequired[Nullable[str]]
@@ -32,9 +31,9 @@ class Event(BaseModel):
 
     name: str
 
-    start_date: datetime
+    start_date: str
 
-    end_date: OptionalNullable[datetime] = UNSET
+    end_date: OptionalNullable[str] = UNSET
 
     latitude: OptionalNullable[float] = UNSET
 
@@ -44,30 +43,25 @@ class Event(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = ["end_date", "latitude", "longitude", "url"]
-        nullable_fields = ["end_date", "latitude", "longitude", "url"]
-        null_default_fields = []
-
+        optional_fields = set(["end_date", "latitude", "longitude", "url"])
+        nullable_fields = set(["end_date", "latitude", "longitude", "url"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/eventdetail.py b/src/owasp_nest/models/eventdetail.py
index 9f4f140..a7cd90d 100644
--- a/src/owasp_nest/models/eventdetail.py
+++ b/src/owasp_nest/models/eventdetail.py
@@ -1,7 +1,6 @@
 """Code generated by Speakeasy (https://speakeasy.com). DO NOT EDIT."""
 
 from __future__ import annotations
-from datetime import datetime
 from owasp_nest.types import (
     BaseModel,
     Nullable,
@@ -18,8 +17,8 @@ class EventDetailTypedDict(TypedDict):
 
     key: str
     name: str
-    start_date: datetime
-    end_date: NotRequired[Nullable[datetime]]
+    start_date: str
+    end_date: NotRequired[Nullable[str]]
     latitude: NotRequired[Nullable[float]]
     longitude: NotRequired[Nullable[float]]
     url: NotRequired[Nullable[str]]
@@ -33,9 +32,9 @@ class EventDetail(BaseModel):
 
     name: str
 
-    start_date: datetime
+    start_date: str
 
-    end_date: OptionalNullable[datetime] = UNSET
+    end_date: OptionalNullable[str] = UNSET
 
     latitude: OptionalNullable[float] = UNSET
 
@@ -47,30 +46,29 @@ class EventDetail(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = ["end_date", "latitude", "longitude", "url", "description"]
-        nullable_fields = ["end_date", "latitude", "longitude", "url", "description"]
-        null_default_fields = []
-
+        optional_fields = set(
+            ["end_date", "latitude", "longitude", "url", "description"]
+        )
+        nullable_fields = set(
+            ["end_date", "latitude", "longitude", "url", "description"]
+        )
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/leader.py b/src/owasp_nest/models/leader.py
index a323917..cf80675 100644
--- a/src/owasp_nest/models/leader.py
+++ b/src/owasp_nest/models/leader.py
@@ -28,30 +28,25 @@ class Leader(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = ["key"]
-        nullable_fields = ["key"]
-        null_default_fields = []
-
+        optional_fields = set(["key"])
+        nullable_fields = set(["key"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/list_chaptersop.py b/src/owasp_nest/models/list_chaptersop.py
index b78e558..2dbee21 100644
--- a/src/owasp_nest/models/list_chaptersop.py
+++ b/src/owasp_nest/models/list_chaptersop.py
@@ -98,46 +98,45 @@ class ListChaptersRequest(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = [
-            "latitude_gte",
-            "latitude_lte",
-            "longitude_gte",
-            "longitude_lte",
-            "country",
-            "ordering",
-            "page",
-            "page_size",
-        ]
-        nullable_fields = [
-            "latitude_gte",
-            "latitude_lte",
-            "longitude_gte",
-            "longitude_lte",
-            "country",
-            "ordering",
-        ]
-        null_default_fields = []
-
+        optional_fields = set(
+            [
+                "latitude_gte",
+                "latitude_lte",
+                "longitude_gte",
+                "longitude_lte",
+                "country",
+                "ordering",
+                "page",
+                "page_size",
+            ]
+        )
+        nullable_fields = set(
+            [
+                "latitude_gte",
+                "latitude_lte",
+                "longitude_gte",
+                "longitude_lte",
+                "country",
+                "ordering",
+            ]
+        )
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/list_committeesop.py b/src/owasp_nest/models/list_committeesop.py
index c65153b..82b1473 100644
--- a/src/owasp_nest/models/list_committeesop.py
+++ b/src/owasp_nest/models/list_committeesop.py
@@ -54,30 +54,25 @@ class ListCommitteesRequest(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = ["ordering", "page", "page_size"]
-        nullable_fields = ["ordering"]
-        null_default_fields = []
-
+        optional_fields = set(["ordering", "page", "page_size"])
+        nullable_fields = set(["ordering"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/list_eventsop.py b/src/owasp_nest/models/list_eventsop.py
index 042bf64..182e604 100644
--- a/src/owasp_nest/models/list_eventsop.py
+++ b/src/owasp_nest/models/list_eventsop.py
@@ -98,46 +98,45 @@ class ListEventsRequest(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = [
-            "latitude_gte",
-            "latitude_lte",
-            "longitude_gte",
-            "longitude_lte",
-            "ordering",
-            "is_upcoming",
-            "page",
-            "page_size",
-        ]
-        nullable_fields = [
-            "latitude_gte",
-            "latitude_lte",
-            "longitude_gte",
-            "longitude_lte",
-            "ordering",
-            "is_upcoming",
-        ]
-        null_default_fields = []
-
+        optional_fields = set(
+            [
+                "latitude_gte",
+                "latitude_lte",
+                "longitude_gte",
+                "longitude_lte",
+                "ordering",
+                "is_upcoming",
+                "page",
+                "page_size",
+            ]
+        )
+        nullable_fields = set(
+            [
+                "latitude_gte",
+                "latitude_lte",
+                "longitude_gte",
+                "longitude_lte",
+                "ordering",
+                "is_upcoming",
+            ]
+        )
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/list_issuesop.py b/src/owasp_nest/models/list_issuesop.py
index 7e7e19f..e1e0cc9 100644
--- a/src/owasp_nest/models/list_issuesop.py
+++ b/src/owasp_nest/models/list_issuesop.py
@@ -79,37 +79,27 @@ class ListIssuesRequest(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = [
-            "organization",
-            "repository",
-            "state",
-            "ordering",
-            "page",
-            "page_size",
-        ]
-        nullable_fields = ["organization", "repository", "state", "ordering"]
-        null_default_fields = []
-
+        optional_fields = set(
+            ["organization", "repository", "state", "ordering", "page", "page_size"]
+        )
+        nullable_fields = set(["organization", "repository", "state", "ordering"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/list_membersop.py b/src/owasp_nest/models/list_membersop.py
index e73cfe6..989e39a 100644
--- a/src/owasp_nest/models/list_membersop.py
+++ b/src/owasp_nest/models/list_membersop.py
@@ -70,30 +70,25 @@ class ListMembersRequest(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = ["company", "location", "ordering", "page", "page_size"]
-        nullable_fields = ["company", "location", "ordering"]
-        null_default_fields = []
-
+        optional_fields = set(["company", "location", "ordering", "page", "page_size"])
+        nullable_fields = set(["company", "location", "ordering"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/list_milestonesop.py b/src/owasp_nest/models/list_milestonesop.py
index 47d1c96..9222723 100644
--- a/src/owasp_nest/models/list_milestonesop.py
+++ b/src/owasp_nest/models/list_milestonesop.py
@@ -75,37 +75,27 @@ class ListMilestonesRequest(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = [
-            "organization",
-            "repository",
-            "state",
-            "ordering",
-            "page",
-            "page_size",
-        ]
-        nullable_fields = ["organization", "repository", "state", "ordering"]
-        null_default_fields = []
-
+        optional_fields = set(
+            ["organization", "repository", "state", "ordering", "page", "page_size"]
+        )
+        nullable_fields = set(["organization", "repository", "state", "ordering"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/list_organizationsop.py b/src/owasp_nest/models/list_organizationsop.py
index e5da7ad..417e0dc 100644
--- a/src/owasp_nest/models/list_organizationsop.py
+++ b/src/owasp_nest/models/list_organizationsop.py
@@ -62,30 +62,25 @@ class ListOrganizationsRequest(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = ["location", "ordering", "page", "page_size"]
-        nullable_fields = ["location", "ordering"]
-        null_default_fields = []
-
+        optional_fields = set(["location", "ordering", "page", "page_size"])
+        nullable_fields = set(["location", "ordering"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/list_projectsop.py b/src/owasp_nest/models/list_projectsop.py
index 12233f0..2fb7621 100644
--- a/src/owasp_nest/models/list_projectsop.py
+++ b/src/owasp_nest/models/list_projectsop.py
@@ -28,6 +28,8 @@ class ListProjectsOrdering(str, Enum):
 class ListProjectsRequestTypedDict(TypedDict):
     level: NotRequired[Nullable[ProjectLevel]]
     r"""Level of the project"""
+    q: NotRequired[Nullable[str]]
+    r"""Structured search query (e.g. 'name:security stars:>100')"""
     ordering: NotRequired[Nullable[ListProjectsOrdering]]
     r"""Ordering field"""
     page: NotRequired[int]
@@ -43,6 +45,12 @@ class ListProjectsRequest(BaseModel):
     ] = UNSET
     r"""Level of the project"""
 
+    q: Annotated[
+        OptionalNullable[str],
+        FieldMetadata(query=QueryParamMetadata(style="form", explode=True)),
+    ] = UNSET
+    r"""Structured search query (e.g. 'name:security stars:>100')"""
+
     ordering: Annotated[
         OptionalNullable[ListProjectsOrdering],
         FieldMetadata(query=QueryParamMetadata(style="form", explode=True)),
@@ -63,30 +71,25 @@ class ListProjectsRequest(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = ["level", "ordering", "page", "page_size"]
-        nullable_fields = ["level", "ordering"]
-        null_default_fields = []
-
+        optional_fields = set(["level", "q", "ordering", "page", "page_size"])
+        nullable_fields = set(["level", "q", "ordering"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/list_releasesop.py b/src/owasp_nest/models/list_releasesop.py
index 135973c..a55e884 100644
--- a/src/owasp_nest/models/list_releasesop.py
+++ b/src/owasp_nest/models/list_releasesop.py
@@ -78,37 +78,27 @@ class ListReleasesRequest(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = [
-            "organization",
-            "repository",
-            "tag_name",
-            "ordering",
-            "page",
-            "page_size",
-        ]
-        nullable_fields = ["organization", "repository", "tag_name", "ordering"]
-        null_default_fields = []
-
+        optional_fields = set(
+            ["organization", "repository", "tag_name", "ordering", "page", "page_size"]
+        )
+        nullable_fields = set(["organization", "repository", "tag_name", "ordering"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/list_repositoriesop.py b/src/owasp_nest/models/list_repositoriesop.py
index 08e0687..1a1c5a7 100644
--- a/src/owasp_nest/models/list_repositoriesop.py
+++ b/src/owasp_nest/models/list_repositoriesop.py
@@ -62,30 +62,25 @@ class ListRepositoriesRequest(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = ["organization_id", "ordering", "page", "page_size"]
-        nullable_fields = ["organization_id", "ordering"]
-        null_default_fields = []
-
+        optional_fields = set(["organization_id", "ordering", "page", "page_size"])
+        nullable_fields = set(["organization_id", "ordering"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/list_snapshot_chaptersop.py b/src/owasp_nest/models/list_snapshot_chaptersop.py
index d54a824..76df097 100644
--- a/src/owasp_nest/models/list_snapshot_chaptersop.py
+++ b/src/owasp_nest/models/list_snapshot_chaptersop.py
@@ -59,30 +59,25 @@ class ListSnapshotChaptersRequest(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = ["ordering", "page", "page_size"]
-        nullable_fields = ["ordering"]
-        null_default_fields = []
-
+        optional_fields = set(["ordering", "page", "page_size"])
+        nullable_fields = set(["ordering"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/list_snapshot_issuesop.py b/src/owasp_nest/models/list_snapshot_issuesop.py
index 9d8f8c3..35052aa 100644
--- a/src/owasp_nest/models/list_snapshot_issuesop.py
+++ b/src/owasp_nest/models/list_snapshot_issuesop.py
@@ -59,30 +59,25 @@ class ListSnapshotIssuesRequest(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = ["ordering", "page", "page_size"]
-        nullable_fields = ["ordering"]
-        null_default_fields = []
-
+        optional_fields = set(["ordering", "page", "page_size"])
+        nullable_fields = set(["ordering"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/list_snapshot_membersop.py b/src/owasp_nest/models/list_snapshot_membersop.py
index 337497b..2a8583b 100644
--- a/src/owasp_nest/models/list_snapshot_membersop.py
+++ b/src/owasp_nest/models/list_snapshot_membersop.py
@@ -59,30 +59,25 @@ class ListSnapshotMembersRequest(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = ["ordering", "page", "page_size"]
-        nullable_fields = ["ordering"]
-        null_default_fields = []
-
+        optional_fields = set(["ordering", "page", "page_size"])
+        nullable_fields = set(["ordering"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/list_snapshot_projectsop.py b/src/owasp_nest/models/list_snapshot_projectsop.py
index 6849718..b63f5e7 100644
--- a/src/owasp_nest/models/list_snapshot_projectsop.py
+++ b/src/owasp_nest/models/list_snapshot_projectsop.py
@@ -59,30 +59,25 @@ class ListSnapshotProjectsRequest(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = ["ordering", "page", "page_size"]
-        nullable_fields = ["ordering"]
-        null_default_fields = []
-
+        optional_fields = set(["ordering", "page", "page_size"])
+        nullable_fields = set(["ordering"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/list_snapshot_releasesop.py b/src/owasp_nest/models/list_snapshot_releasesop.py
index 3d32d67..8f3314d 100644
--- a/src/owasp_nest/models/list_snapshot_releasesop.py
+++ b/src/owasp_nest/models/list_snapshot_releasesop.py
@@ -59,30 +59,25 @@ class ListSnapshotReleasesRequest(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = ["ordering", "page", "page_size"]
-        nullable_fields = ["ordering"]
-        null_default_fields = []
-
+        optional_fields = set(["ordering", "page", "page_size"])
+        nullable_fields = set(["ordering"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/list_snapshotsop.py b/src/owasp_nest/models/list_snapshotsop.py
index 270c932..99f2f41 100644
--- a/src/owasp_nest/models/list_snapshotsop.py
+++ b/src/owasp_nest/models/list_snapshotsop.py
@@ -56,30 +56,25 @@ class ListSnapshotsRequest(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = ["ordering", "page", "page_size"]
-        nullable_fields = ["ordering"]
-        null_default_fields = []
-
+        optional_fields = set(["ordering", "page", "page_size"])
+        nullable_fields = set(["ordering"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/list_sponsorsop.py b/src/owasp_nest/models/list_sponsorsop.py
index 5187dc7..3353fb0 100644
--- a/src/owasp_nest/models/list_sponsorsop.py
+++ b/src/owasp_nest/models/list_sponsorsop.py
@@ -77,37 +77,34 @@ class ListSponsorsRequest(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = [
-            "is_member",
-            "member_type",
-            "sponsor_type",
-            "ordering",
-            "page",
-            "page_size",
-        ]
-        nullable_fields = ["is_member", "member_type", "sponsor_type", "ordering"]
-        null_default_fields = []
-
+        optional_fields = set(
+            [
+                "is_member",
+                "member_type",
+                "sponsor_type",
+                "ordering",
+                "page",
+                "page_size",
+            ]
+        )
+        nullable_fields = set(["is_member", "member_type", "sponsor_type", "ordering"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/milestonedetail.py b/src/owasp_nest/models/milestonedetail.py
index 928283a..170f67e 100644
--- a/src/owasp_nest/models/milestonedetail.py
+++ b/src/owasp_nest/models/milestonedetail.py
@@ -48,30 +48,14 @@ class MilestoneDetail(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = []
-        nullable_fields = ["due_on"]
-        null_default_fields = []
-
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
 
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
+            if val != UNSET_SENTINEL:
                 m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/release.py b/src/owasp_nest/models/release.py
index fd82e37..0449dbf 100644
--- a/src/owasp_nest/models/release.py
+++ b/src/owasp_nest/models/release.py
@@ -35,30 +35,25 @@ class Release(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = ["published_at"]
-        nullable_fields = ["published_at"]
-        null_default_fields = []
-
+        optional_fields = set(["published_at"])
+        nullable_fields = set(["published_at"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/releasedetail.py b/src/owasp_nest/models/releasedetail.py
index 0c7ea93..f478c02 100644
--- a/src/owasp_nest/models/releasedetail.py
+++ b/src/owasp_nest/models/releasedetail.py
@@ -38,30 +38,25 @@ class ReleaseDetail(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = ["published_at"]
-        nullable_fields = ["published_at"]
-        null_default_fields = []
-
+        optional_fields = set(["published_at"])
+        nullable_fields = set(["published_at"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/repositorydetail.py b/src/owasp_nest/models/repositorydetail.py
index 1998ff0..88c814c 100644
--- a/src/owasp_nest/models/repositorydetail.py
+++ b/src/owasp_nest/models/repositorydetail.py
@@ -50,30 +50,25 @@ class RepositoryDetail(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = ["description"]
-        nullable_fields = ["description"]
-        null_default_fields = []
-
+        optional_fields = set(["description"])
+        nullable_fields = set(["description"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/snapshotissue.py b/src/owasp_nest/models/snapshotissue.py
index 3037f45..558e0d3 100644
--- a/src/owasp_nest/models/snapshotissue.py
+++ b/src/owasp_nest/models/snapshotissue.py
@@ -39,30 +39,14 @@ class SnapshotIssue(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = []
-        nullable_fields = ["organization_login", "repository_name"]
-        null_default_fields = []
-
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
 
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
+            if val != UNSET_SENTINEL:
                 m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/snapshotrelease.py b/src/owasp_nest/models/snapshotrelease.py
index 5af7ddc..12b5483 100644
--- a/src/owasp_nest/models/snapshotrelease.py
+++ b/src/owasp_nest/models/snapshotrelease.py
@@ -41,30 +41,25 @@ class SnapshotRelease(BaseModel):
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = ["published_at"]
-        nullable_fields = ["published_at", "organization_login", "repository_name"]
-        null_default_fields = []
-
+        optional_fields = set(["published_at"])
+        nullable_fields = set(["published_at", "organization_login", "repository_name"])
         serialized = handler(self)
-
         m = {}
 
         for n, f in type(self).model_fields.items():
             k = f.alias or n
             val = serialized.get(k)
-            serialized.pop(k, None)
-
-            optional_nullable = k in optional_fields and k in nullable_fields
-            is_set = (
-                self.__pydantic_fields_set__.intersection({n})
-                or k in null_default_fields
-            )  # pylint: disable=no-member
-
-            if val is not None and val != UNSET_SENTINEL:
-                m[k] = val
-            elif val != UNSET_SENTINEL and (
-                not k in optional_fields or (optional_nullable and is_set)
-            ):
-                m[k] = val
+            is_nullable_and_explicitly_set = (
+                k in nullable_fields
+                and (self.__pydantic_fields_set__.intersection({n}))  # pylint: disable=no-member
+            )
+
+            if val != UNSET_SENTINEL:
+                if (
+                    val is not None
+                    or k not in optional_fields
+                    or is_nullable_and_explicitly_set
+                ):
+                    m[k] = val
 
         return m
diff --git a/src/owasp_nest/models/validationerrorschema.py b/src/owasp_nest/models/validationerrorschema.py
new file mode 100644
index 0000000..ab9e722
--- /dev/null
+++ b/src/owasp_nest/models/validationerrorschema.py
@@ -0,0 +1,40 @@
+"""Code generated by Speakeasy (https://speakeasy.com). DO NOT EDIT."""
+
+from __future__ import annotations
+from dataclasses import dataclass, field
+import httpx
+from owasp_nest.models import NestError
+from owasp_nest.types import BaseModel, OptionalNullable, UNSET
+from typing import Any, Dict, List, Optional, Union
+from typing_extensions import TypeAliasType
+
+
+ErrorsTypedDict = TypeAliasType(
+    "ErrorsTypedDict", Union[List[Dict[str, Any]], Dict[str, Any]]
+)
+
+
+Errors = TypeAliasType("Errors", Union[List[Dict[str, Any]], Dict[str, Any]])
+
+
+class ValidationErrorSchemaData(BaseModel):
+    message: str
+    errors: OptionalNullable[Errors] = UNSET
+
+
+@dataclass(unsafe_hash=True)
+class ValidationErrorSchema(NestError):
+    r"""Schema for validation error."""
+
+    data: ValidationErrorSchemaData = field(hash=False)
+
+    def __init__(
+        self,
+        data: ValidationErrorSchemaData,
+        raw_response: httpx.Response,
+        body: Optional[str] = None,
+    ):
+        fallback = body or raw_response.text
+        message = str(data.message) or fallback
+        super().__init__(message, raw_response, body)
+        object.__setattr__(self, "data", data)
diff --git a/src/owasp_nest/projects.py b/src/owasp_nest/projects.py
index cf428b1..825ed28 100644
--- a/src/owasp_nest/projects.py
+++ b/src/owasp_nest/projects.py
@@ -13,6 +13,7 @@ def list_projects(
         self,
         *,
         level: OptionalNullable[models.ProjectLevel] = UNSET,
+        q: OptionalNullable[str] = UNSET,
         ordering: OptionalNullable[models.ListProjectsOrdering] = UNSET,
         page: Optional[int] = 1,
         page_size: Optional[int] = 100,
@@ -26,6 +27,7 @@ def list_projects(
         Retrieve a paginated list of OWASP projects.
 
         :param level: Level of the project
+        :param q: Structured search query (e.g. 'name:security stars:>100')
         :param ordering: Ordering field
         :param page: Page number
         :param page_size: Number of items per page
@@ -46,6 +48,7 @@ def list_projects(
 
         request = models.ListProjectsRequest(
             level=level,
+            q=q,
             ordering=ordering,
             page=page,
             page_size=page_size,
@@ -104,6 +107,7 @@ async def list_projects_async(
         self,
         *,
         level: OptionalNullable[models.ProjectLevel] = UNSET,
+        q: OptionalNullable[str] = UNSET,
         ordering: OptionalNullable[models.ListProjectsOrdering] = UNSET,
         page: Optional[int] = 1,
         page_size: Optional[int] = 100,
@@ -117,6 +121,7 @@ async def list_projects_async(
         Retrieve a paginated list of OWASP projects.
 
         :param level: Level of the project
+        :param q: Structured search query (e.g. 'name:security stars:>100')
         :param ordering: Ordering field
         :param page: Page number
         :param page_size: Number of items per page
@@ -137,6 +142,7 @@ async def list_projects_async(
 
         request = models.ListProjectsRequest(
             level=level,
+            q=q,
             ordering=ordering,
             page=page,
             page_size=page_size,
@@ -258,13 +264,18 @@ def get_project(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.ProjectDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(models.ProjectErrorData, http_res)
             raise models.ProjectError(response_data, http_res)
@@ -344,13 +355,18 @@ async def get_project_async(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.ProjectDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(models.ProjectErrorData, http_res)
             raise models.ProjectError(response_data, http_res)
diff --git a/src/owasp_nest/releases.py b/src/owasp_nest/releases.py
index 5aab1f2..e528147 100644
--- a/src/owasp_nest/releases.py
+++ b/src/owasp_nest/releases.py
@@ -276,13 +276,18 @@ def get_release(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.ReleaseDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(models.ReleaseErrorData, http_res)
             raise models.ReleaseError(response_data, http_res)
@@ -368,13 +373,18 @@ async def get_release_async(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.ReleaseDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(models.ReleaseErrorData, http_res)
             raise models.ReleaseError(response_data, http_res)
diff --git a/src/owasp_nest/repositories.py b/src/owasp_nest/repositories.py
index 344fe7e..735aeb3 100644
--- a/src/owasp_nest/repositories.py
+++ b/src/owasp_nest/repositories.py
@@ -261,13 +261,18 @@ def get_repository(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.RepositoryDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(
                 models.RepositoryErrorData, http_res
@@ -352,13 +357,18 @@ async def get_repository_async(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.RepositoryDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(
                 models.RepositoryErrorData, http_res
diff --git a/src/owasp_nest/sponsors.py b/src/owasp_nest/sponsors.py
index d449257..a9ebc67 100644
--- a/src/owasp_nest/sponsors.py
+++ b/src/owasp_nest/sponsors.py
@@ -270,13 +270,18 @@ def get_sponsor(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.SponsorDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(models.SponsorErrorData, http_res)
             raise models.SponsorError(response_data, http_res)
@@ -356,13 +361,18 @@ async def get_sponsor_async(
                 security_source=self.sdk_configuration.security,
             ),
             request=req,
-            error_status_codes=["404", "4XX", "5XX"],
+            error_status_codes=["400", "404", "4XX", "5XX"],
             retry_config=retry_config,
         )
 
         response_data: Any = None
         if utils.match_response(http_res, "200", "application/json"):
             return unmarshal_json_response(models.SponsorDetail, http_res)
+        if utils.match_response(http_res, "400", "application/json"):
+            response_data = unmarshal_json_response(
+                models.ValidationErrorSchemaData, http_res
+            )
+            raise models.ValidationErrorSchema(response_data, http_res)
         if utils.match_response(http_res, "404", "application/json"):
             response_data = unmarshal_json_response(models.SponsorErrorData, http_res)
             raise models.SponsorError(response_data, http_res)
diff --git a/src/owasp_nest/types/basemodel.py b/src/owasp_nest/types/basemodel.py
index 231c2e3..a9a640a 100644
--- a/src/owasp_nest/types/basemodel.py
+++ b/src/owasp_nest/types/basemodel.py
@@ -2,7 +2,8 @@
 
 from pydantic import ConfigDict, model_serializer
 from pydantic import BaseModel as PydanticBaseModel
-from typing import TYPE_CHECKING, Literal, Optional, TypeVar, Union
+from pydantic_core import core_schema
+from typing import TYPE_CHECKING, Any, Literal, Optional, TypeVar, Union
 from typing_extensions import TypeAliasType, TypeAlias
 
 
@@ -35,5 +36,42 @@ def __bool__(self) -> Literal[False]:
         "OptionalNullable", Union[Optional[Nullable[T]], Unset], type_params=(T,)
     )
 
-UnrecognizedInt: TypeAlias = int
-UnrecognizedStr: TypeAlias = str
+
+class UnrecognizedStr(str):
+    @classmethod
+    def __get_pydantic_core_schema__(cls, _source_type: Any, _handler: Any) -> core_schema.CoreSchema:
+        # Make UnrecognizedStr only work in lax mode, not strict mode
+        # This makes it a "fallback" option when more specific types (like Literals) don't match
+        def validate_lax(v: Any) -> 'UnrecognizedStr':
+            if isinstance(v, cls):
+                return v
+            return cls(str(v))
+
+        # Use lax_or_strict_schema where strict always fails
+        # This forces Pydantic to prefer other union members in strict mode
+        # and only fall back to UnrecognizedStr in lax mode
+        return core_schema.lax_or_strict_schema(
+            lax_schema=core_schema.chain_schema([
+                core_schema.str_schema(),
+                core_schema.no_info_plain_validator_function(validate_lax)
+            ]),
+            strict_schema=core_schema.none_schema(),  # Always fails in strict mode
+        )
+
+
+class UnrecognizedInt(int):
+    @classmethod
+    def __get_pydantic_core_schema__(cls, _source_type: Any, _handler: Any) -> core_schema.CoreSchema:
+        # Make UnrecognizedInt only work in lax mode, not strict mode
+        # This makes it a "fallback" option when more specific types (like Literals) don't match
+        def validate_lax(v: Any) -> 'UnrecognizedInt':
+            if isinstance(v, cls):
+                return v
+            return cls(int(v))
+        return core_schema.lax_or_strict_schema(
+            lax_schema=core_schema.chain_schema([
+                core_schema.int_schema(),
+                core_schema.no_info_plain_validator_function(validate_lax)
+            ]),
+            strict_schema=core_schema.none_schema(),  # Always fails in strict mode
+        )
diff --git a/src/owasp_nest/utils/__init__.py b/src/owasp_nest/utils/__init__.py
index 56164cf..15394a0 100644
--- a/src/owasp_nest/utils/__init__.py
+++ b/src/owasp_nest/utils/__init__.py
@@ -1,10 +1,19 @@
 """Code generated by Speakeasy (https://speakeasy.com). DO NOT EDIT."""
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Callable, TypeVar
 from importlib import import_module
+import asyncio
 import builtins
 import sys
 
+_T = TypeVar("_T")
+
+
+async def run_sync_in_thread(func: Callable[..., _T], *args) -> _T:
+    """Run a synchronous function in a thread pool to avoid blocking the event loop."""
+    return await asyncio.to_thread(func, *args)
+
+
 if TYPE_CHECKING:
     from .annotations import get_discriminator
     from .datetimes import parse_datetime
@@ -41,7 +50,6 @@
         validate_decimal,
         validate_float,
         validate_int,
-        validate_open_enum,
     )
     from .url import generate_url, template_url, remove_suffix
     from .values import (
@@ -102,7 +110,6 @@
     "validate_const",
     "validate_float",
     "validate_int",
-    "validate_open_enum",
     "cast_partial",
 ]
 
@@ -155,7 +162,6 @@
     "validate_const": ".serializers",
     "validate_float": ".serializers",
     "validate_int": ".serializers",
-    "validate_open_enum": ".serializers",
     "cast_partial": ".values",
 }
 
diff --git a/src/owasp_nest/utils/enums.py b/src/owasp_nest/utils/enums.py
index c3bc13c..3324e1b 100644
--- a/src/owasp_nest/utils/enums.py
+++ b/src/owasp_nest/utils/enums.py
@@ -2,6 +2,10 @@
 
 import enum
 import sys
+from typing import Any
+
+from pydantic_core import core_schema
+
 
 class OpenEnumMeta(enum.EnumMeta):
     # The __call__ method `boundary` kwarg was added in 3.11 and must be present
@@ -72,3 +76,59 @@ def __call__(
                 )
             except ValueError:
                 return value
+
+    def __new__(mcs, name, bases, namespace, **kwargs):
+        cls = super().__new__(mcs, name, bases, namespace, **kwargs)
+
+        # Add __get_pydantic_core_schema__ to make open enums work correctly
+        # in union discrimination. In strict mode (used by Pydantic for unions),
+        # only known enum values match. In lax mode, unknown values are accepted.
+        def __get_pydantic_core_schema__(
+            cls_inner: Any, _source_type: Any, _handler: Any
+        ) -> core_schema.CoreSchema:
+            # Create a validator that only accepts known enum values (for strict mode)
+            def validate_strict(v: Any) -> Any:
+                if isinstance(v, cls_inner):
+                    return v
+                # Use the parent EnumMeta's __call__ which raises ValueError for unknown values
+                return enum.EnumMeta.__call__(cls_inner, v)
+
+            # Create a lax validator that accepts unknown values
+            def validate_lax(v: Any) -> Any:
+                if isinstance(v, cls_inner):
+                    return v
+                try:
+                    return enum.EnumMeta.__call__(cls_inner, v)
+                except ValueError:
+                    # Return the raw value for unknown enum values
+                    return v
+
+            # Determine the base type schema (str or int)
+            is_int_enum = False
+            for base in cls_inner.__mro__:
+                if base is int:
+                    is_int_enum = True
+                    break
+                if base is str:
+                    break
+
+            base_schema = (
+                core_schema.int_schema()
+                if is_int_enum
+                else core_schema.str_schema()
+            )
+
+            # Use lax_or_strict_schema:
+            # - strict mode: only known enum values match (raises ValueError for unknown)
+            # - lax mode: accept any value, return enum member or raw value
+            return core_schema.lax_or_strict_schema(
+                lax_schema=core_schema.chain_schema(
+                    [base_schema, core_schema.no_info_plain_validator_function(validate_lax)]
+                ),
+                strict_schema=core_schema.chain_schema(
+                    [base_schema, core_schema.no_info_plain_validator_function(validate_strict)]
+                ),
+            )
+
+        setattr(cls, "__get_pydantic_core_schema__", classmethod(__get_pydantic_core_schema__))
+        return cls
diff --git a/src/owasp_nest/utils/eventstreaming.py b/src/owasp_nest/utils/eventstreaming.py
index 0969899..f2052fc 100644
--- a/src/owasp_nest/utils/eventstreaming.py
+++ b/src/owasp_nest/utils/eventstreaming.py
@@ -2,7 +2,9 @@
 
 import re
 import json
+from dataclasses import dataclass, asdict
 from typing import (
+    Any,
     Callable,
     Generic,
     TypeVar,
@@ -22,6 +24,7 @@ class EventStream(Generic[T]):
     client_ref: Optional[object]
     response: httpx.Response
     generator: Generator[T, None, None]
+    _closed: bool
 
     def __init__(
         self,
@@ -33,17 +36,21 @@ def __init__(
         self.response = response
         self.generator = stream_events(response, decoder, sentinel)
         self.client_ref = client_ref
+        self._closed = False
 
     def __iter__(self):
         return self
 
     def __next__(self):
+        if self._closed:
+            raise StopIteration
         return next(self.generator)
 
     def __enter__(self):
         return self
 
     def __exit__(self, exc_type, exc_val, exc_tb):
+        self._closed = True
         self.response.close()
 
 
@@ -53,6 +60,7 @@ class EventStreamAsync(Generic[T]):
     client_ref: Optional[object]
     response: httpx.Response
     generator: AsyncGenerator[T, None]
+    _closed: bool
 
     def __init__(
         self,
@@ -64,33 +72,45 @@ def __init__(
         self.response = response
         self.generator = stream_events_async(response, decoder, sentinel)
         self.client_ref = client_ref
+        self._closed = False
 
     def __aiter__(self):
         return self
 
     async def __anext__(self):
+        if self._closed:
+            raise StopAsyncIteration
         return await self.generator.__anext__()
 
     async def __aenter__(self):
         return self
 
     async def __aexit__(self, exc_type, exc_val, exc_tb):
+        self._closed = True
         await self.response.aclose()
 
 
+@dataclass
 class ServerEvent:
     id: Optional[str] = None
     event: Optional[str] = None
-    data: Optional[str] = None
+    data: Any = None
     retry: Optional[int] = None
 
 
 MESSAGE_BOUNDARIES = [
     b"\r\n\r\n",
-    b"\n\n",
+    b"\r\n\r",
+    b"\r\n\n",
+    b"\r\r\n",
+    b"\n\r\n",
     b"\r\r",
+    b"\n\r",
+    b"\n\n",
 ]
 
+UTF8_BOM = b"\xef\xbb\xbf"
+
 
 async def stream_events_async(
     response: httpx.Response,
@@ -99,14 +119,10 @@ async def stream_events_async(
 ) -> AsyncGenerator[T, None]:
     buffer = bytearray()
     position = 0
-    discard = False
+    event_id: Optional[str] = None
     async for chunk in response.aiter_bytes():
-        # We've encountered the sentinel value and should no longer process
-        # incoming data. Instead we throw new data away until the server closes
-        # the connection.
-        if discard:
-            continue
-
+        if len(buffer) == 0 and chunk.startswith(UTF8_BOM):
+            chunk = chunk[len(UTF8_BOM) :]
         buffer += chunk
         for i in range(position, len(buffer)):
             char = buffer[i : i + 1]
@@ -121,15 +137,22 @@ async def stream_events_async(
 
             block = buffer[position:i]
             position = i + len(seq)
-            event, discard = _parse_event(block, decoder, sentinel)
+            event, discard, event_id = _parse_event(
+                raw=block, decoder=decoder, sentinel=sentinel, event_id=event_id
+            )
             if event is not None:
                 yield event
+            if discard:
+                await response.aclose()
+                return
 
         if position > 0:
             buffer = buffer[position:]
             position = 0
 
-    event, discard = _parse_event(buffer, decoder, sentinel)
+    event, discard, _ = _parse_event(
+        raw=buffer, decoder=decoder, sentinel=sentinel, event_id=event_id
+    )
     if event is not None:
         yield event
 
@@ -141,14 +164,10 @@ def stream_events(
 ) -> Generator[T, None, None]:
     buffer = bytearray()
     position = 0
-    discard = False
+    event_id: Optional[str] = None
     for chunk in response.iter_bytes():
-        # We've encountered the sentinel value and should no longer process
-        # incoming data. Instead we throw new data away until the server closes
-        # the connection.
-        if discard:
-            continue
-
+        if len(buffer) == 0 and chunk.startswith(UTF8_BOM):
+            chunk = chunk[len(UTF8_BOM) :]
         buffer += chunk
         for i in range(position, len(buffer)):
             char = buffer[i : i + 1]
@@ -163,22 +182,33 @@ def stream_events(
 
             block = buffer[position:i]
             position = i + len(seq)
-            event, discard = _parse_event(block, decoder, sentinel)
+            event, discard, event_id = _parse_event(
+                raw=block, decoder=decoder, sentinel=sentinel, event_id=event_id
+            )
             if event is not None:
                 yield event
+            if discard:
+                response.close()
+                return
 
         if position > 0:
             buffer = buffer[position:]
             position = 0
 
-    event, discard = _parse_event(buffer, decoder, sentinel)
+    event, discard, _ = _parse_event(
+        raw=buffer, decoder=decoder, sentinel=sentinel, event_id=event_id
+    )
     if event is not None:
         yield event
 
 
 def _parse_event(
-    raw: bytearray, decoder: Callable[[str], T], sentinel: Optional[str] = None
-) -> Tuple[Optional[T], bool]:
+    *,
+    raw: bytearray,
+    decoder: Callable[[str], T],
+    sentinel: Optional[str] = None,
+    event_id: Optional[str] = None,
+) -> Tuple[Optional[T], bool, Optional[str]]:
     block = raw.decode()
     lines = re.split(r"\r?\n|\r", block)
     publish = False
@@ -189,13 +219,16 @@ def _parse_event(
             continue
 
         delim = line.find(":")
-        if delim <= 0:
+        if delim == 0:
             continue
 
-        field = line[0:delim]
-        value = line[delim + 1 :] if delim < len(line) - 1 else ""
-        if len(value) and value[0] == " ":
-            value = value[1:]
+        field = line
+        value = ""
+        if delim > 0:
+            field = line[0:delim]
+            value = line[delim + 1 :] if delim < len(line) - 1 else ""
+            if len(value) and value[0] == " ":
+                value = value[1:]
 
         if field == "event":
             event.event = value
@@ -204,37 +237,36 @@ def _parse_event(
             data += value + "\n"
             publish = True
         elif field == "id":
-            event.id = value
             publish = True
+            if "\x00" not in value:
+                event_id = value
         elif field == "retry":
-            event.retry = int(value) if value.isdigit() else None
+            if value.isdigit():
+                event.retry = int(value)
             publish = True
 
+    event.id = event_id
+
     if sentinel and data == f"{sentinel}\n":
-        return None, True
+        return None, True, event_id
 
     if data:
         data = data[:-1]
-        event.data = data
-
-        data_is_primitive = (
-            data.isnumeric() or data == "true" or data == "false" or data == "null"
-        )
-        data_is_json = (
-            data.startswith("{") or data.startswith("[") or data.startswith('"')
-        )
-
-        if data_is_primitive or data_is_json:
-            try:
-                event.data = json.loads(data)
-            except Exception:
-                pass
+        try:
+            event.data = json.loads(data)
+        except json.JSONDecodeError:
+            event.data = data
 
     out = None
     if publish:
-        out = decoder(json.dumps(event.__dict__))
-
-    return out, False
+        out_dict = {
+            k: v
+            for k, v in asdict(event).items()
+            if v is not None or (k == "data" and data)
+        }
+        out = decoder(json.dumps(out_dict))
+
+    return out, False, event_id
 
 
 def _peek_sequence(position: int, buffer: bytearray, sequence: bytes):
diff --git a/src/owasp_nest/utils/requestbodies.py b/src/owasp_nest/utils/requestbodies.py
index d5240dd..1de32b6 100644
--- a/src/owasp_nest/utils/requestbodies.py
+++ b/src/owasp_nest/utils/requestbodies.py
@@ -44,15 +44,15 @@ def serialize_request_body(
 
     serialized_request_body = SerializedRequestBody(media_type)
 
-    if re.match(r"(application|text)\/.*?\+*json.*", media_type) is not None:
+    if re.match(r"^(application|text)\/([^+]+\+)*json.*", media_type) is not None:
         serialized_request_body.content = marshal_json(request_body, request_body_type)
-    elif re.match(r"multipart\/.*", media_type) is not None:
+    elif re.match(r"^multipart\/.*", media_type) is not None:
         (
             serialized_request_body.media_type,
             serialized_request_body.data,
             serialized_request_body.files,
         ) = serialize_multipart_form(media_type, request_body)
-    elif re.match(r"application\/x-www-form-urlencoded.*", media_type) is not None:
+    elif re.match(r"^application\/x-www-form-urlencoded.*", media_type) is not None:
         serialized_request_body.data = serialize_form_data(request_body)
     elif isinstance(request_body, (bytes, bytearray, io.BytesIO, io.BufferedReader)):
         serialized_request_body.content = request_body
diff --git a/src/owasp_nest/utils/security.py b/src/owasp_nest/utils/security.py
index 295a3f4..17996bd 100644
--- a/src/owasp_nest/utils/security.py
+++ b/src/owasp_nest/utils/security.py
@@ -135,6 +135,8 @@ def _parse_security_scheme_value(
     elif scheme_type == "http":
         if sub_type == "bearer":
             headers[header_name] = _apply_bearer(value)
+        elif sub_type == "basic":
+            headers[header_name] = value
         elif sub_type == "custom":
             return
         else:
diff --git a/src/owasp_nest/utils/serializers.py b/src/owasp_nest/utils/serializers.py
index 378a14c..14321eb 100644
--- a/src/owasp_nest/utils/serializers.py
+++ b/src/owasp_nest/utils/serializers.py
@@ -102,26 +102,6 @@ def validate_int(b):
     return int(b)
 
 
-def validate_open_enum(is_int: bool):
-    def validate(e):
-        if e is None:
-            return None
-
-        if isinstance(e, Unset):
-            return e
-
-        if is_int:
-            if not isinstance(e, int):
-                raise ValueError("Expected int")
-        else:
-            if not isinstance(e, str):
-                raise ValueError("Expected string")
-
-        return e
-
-    return validate
-
-
 def validate_const(v):
     def validate(c):
         # Optional[T] is a Union[T, None]
diff --git a/uv.lock b/uv.lock
index 1906330..830d363 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1,6 +1,6 @@
 version = 1
 revision = 3
-requires-python = ">=3.9.2"
+requires-python = ">=3.10"
 resolution-markers = [
     "python_full_version >= '3.12'",
     "python_full_version == '3.11.*'",
@@ -181,12 +181,6 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/d2/8b/801aa06445d2de3895f59e476f38f3f8d610ef5d6908245f07d002676cbf/mypy-1.15.0-cp313-cp313-manylinux_2_17_x86_64.manylinux2014_x86_64.manylinux_2_28_x86_64.whl", hash = "sha256:c43a7682e24b4f576d93072216bf56eeff70d9140241f9edec0c104d0c515036", size = 12402541, upload-time = "2025-02-05T03:49:57.623Z" },
     { url = "https://files.pythonhosted.org/packages/c7/67/5a4268782eb77344cc613a4cf23540928e41f018a9a1ec4c6882baf20ab8/mypy-1.15.0-cp313-cp313-musllinux_1_2_x86_64.whl", hash = "sha256:baefc32840a9f00babd83251560e0ae1573e2f9d1b067719479bfb0e987c6357", size = 12494348, upload-time = "2025-02-05T03:48:52.361Z" },
     { url = "https://files.pythonhosted.org/packages/83/3e/57bb447f7bbbfaabf1712d96f9df142624a386d98fb026a761532526057e/mypy-1.15.0-cp313-cp313-win_amd64.whl", hash = "sha256:b9378e2c00146c44793c98b8d5a61039a048e31f429fb0eb546d93f4b000bedf", size = 9373648, upload-time = "2025-02-05T03:49:11.395Z" },
-    { url = "https://files.pythonhosted.org/packages/5a/fa/79cf41a55b682794abe71372151dbbf856e3008f6767057229e6649d294a/mypy-1.15.0-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:e601a7fa172c2131bff456bb3ee08a88360760d0d2f8cbd7a75a65497e2df078", size = 10737129, upload-time = "2025-02-05T03:50:24.509Z" },
-    { url = "https://files.pythonhosted.org/packages/d3/33/dd8feb2597d648de29e3da0a8bf4e1afbda472964d2a4a0052203a6f3594/mypy-1.15.0-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:712e962a6357634fef20412699a3655c610110e01cdaa6180acec7fc9f8513ba", size = 9856335, upload-time = "2025-02-05T03:49:36.398Z" },
-    { url = "https://files.pythonhosted.org/packages/e4/b5/74508959c1b06b96674b364ffeb7ae5802646b32929b7701fc6b18447592/mypy-1.15.0-cp39-cp39-manylinux_2_17_aarch64.manylinux2014_aarch64.manylinux_2_28_aarch64.whl", hash = "sha256:f95579473af29ab73a10bada2f9722856792a36ec5af5399b653aa28360290a5", size = 11611935, upload-time = "2025-02-05T03:49:14.154Z" },
-    { url = "https://files.pythonhosted.org/packages/6c/53/da61b9d9973efcd6507183fdad96606996191657fe79701b2c818714d573/mypy-1.15.0-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.manylinux_2_28_x86_64.whl", hash = "sha256:8f8722560a14cde92fdb1e31597760dc35f9f5524cce17836c0d22841830fd5b", size = 12365827, upload-time = "2025-02-05T03:48:59.458Z" },
-    { url = "https://files.pythonhosted.org/packages/c1/72/965bd9ee89540c79a25778cc080c7e6ef40aa1eeac4d52cec7eae6eb5228/mypy-1.15.0-cp39-cp39-musllinux_1_2_x86_64.whl", hash = "sha256:1fbb8da62dc352133d7d7ca90ed2fb0e9d42bb1a32724c287d3c76c58cbaa9c2", size = 12541924, upload-time = "2025-02-05T03:50:03.12Z" },
-    { url = "https://files.pythonhosted.org/packages/46/d0/f41645c2eb263e6c77ada7d76f894c580c9ddb20d77f0c24d34273a4dab2/mypy-1.15.0-cp39-cp39-win_amd64.whl", hash = "sha256:d10d994b41fb3497719bbf866f227b3489048ea4bbbb5015357db306249f7980", size = 9271176, upload-time = "2025-02-05T03:50:10.86Z" },
     { url = "https://files.pythonhosted.org/packages/09/4e/a7d65c7322c510de2c409ff3828b03354a7c43f5a8ed458a7a131b41c7b9/mypy-1.15.0-py3-none-any.whl", hash = "sha256:5469affef548bd1895d86d3bf10ce2b44e33d86923c29e4d675b3e323437ea3e", size = 2221777, upload-time = "2025-02-05T03:50:08.348Z" },
 ]
 
@@ -210,7 +204,7 @@ wheels = [
 
 [[package]]
 name = "owasp-nest"
-version = "0.3.7"
+version = "0.4.0"
 source = { editable = "." }
 dependencies = [
     { name = "httpcore" },
@@ -330,19 +324,6 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/a4/7d/e09391c2eebeab681df2b74bfe6c43422fffede8dc74187b2b0bf6fd7571/pydantic_core-2.33.2-cp313-cp313t-macosx_11_0_arm64.whl", hash = "sha256:61c18fba8e5e9db3ab908620af374db0ac1baa69f0f32df4f61ae23f15e586ac", size = 1806162, upload-time = "2025-04-23T18:32:20.188Z" },
     { url = "https://files.pythonhosted.org/packages/f1/3d/847b6b1fed9f8ed3bb95a9ad04fbd0b212e832d4f0f50ff4d9ee5a9f15cf/pydantic_core-2.33.2-cp313-cp313t-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:95237e53bb015f67b63c91af7518a62a8660376a6a0db19b89acc77a4d6199f5", size = 1981560, upload-time = "2025-04-23T18:32:22.354Z" },
     { url = "https://files.pythonhosted.org/packages/6f/9a/e73262f6c6656262b5fdd723ad90f518f579b7bc8622e43a942eec53c938/pydantic_core-2.33.2-cp313-cp313t-win_amd64.whl", hash = "sha256:c2fc0a768ef76c15ab9238afa6da7f69895bb5d1ee83aeea2e3509af4472d0b9", size = 1935777, upload-time = "2025-04-23T18:32:25.088Z" },
-    { url = "https://files.pythonhosted.org/packages/53/ea/bbe9095cdd771987d13c82d104a9c8559ae9aec1e29f139e286fd2e9256e/pydantic_core-2.33.2-cp39-cp39-macosx_10_12_x86_64.whl", hash = "sha256:a2b911a5b90e0374d03813674bf0a5fbbb7741570dcd4b4e85a2e48d17def29d", size = 2028677, upload-time = "2025-04-23T18:32:27.227Z" },
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