diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 6db3039d0..802e9d13f 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-    ".": "0.9.0"
+    ".": "1.0.0-rc.1"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ab111e90c..c33de901c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,44 @@
 # Changelog
 
+## [1.0.0-rc.1](https://github.com/google/adk-java/compare/v0.9.0...v1.0.0-rc.1) (2026-03-19)
+
+
+### ⚠ BREAKING CHANGES
+
+* remove McpToolset constructors taking Optional parameters
+* remove deprecated Example processor
+
+### Features
+
+* add handling the a2a metadata in the RemoteA2AAgent; Add the enum type for the metadata keys ([e51f911](https://github.com/google/adk-java/commit/e51f9112050955657da0dfc3aedc00f90ad739ec))
+* add type-safe runAsync methods to BaseTool ([b8cb7e2](https://github.com/google/adk-java/commit/b8cb7e2db6d5ce20f4d7a1b237bdc155563cf4bd))
+* Enhance LangChain4j to support MCP tools with parametersJsonSchema ([2c71ba1](https://github.com/google/adk-java/commit/2c71ba1332e052189115cd4644b7a473c31ed414))
+* fixing context propagation for agent transfers ([9a08076](https://github.com/google/adk-java/commit/9a080763d83c319f539d1bacac4595d13b299e7e))
+* Implement basic version of BigQuery Agent Analytics Plugin ([c8ab0f9](https://github.com/google/adk-java/commit/c8ab0f96b09a6c9636728d634c62695fcd622246))
+* init AGENTS.md file ([7ebeb07](https://github.com/google/adk-java/commit/7ebeb07bf2ee72475484d8a31ccf7b4c601dda96))
+* Propagating the otel context ([8556d4a](https://github.com/google/adk-java/commit/8556d4af16ff04c6e3b678dcfc3d4bb232abc550))
+* remove McpToolset constructors taking Optional parameters ([dbb1394](https://github.com/google/adk-java/commit/dbb139439d38157b4b9af38c52824b1e8405a495))
+* Update return type of toolsets() from ImmutableList to List ([cd56902](https://github.com/google/adk-java/commit/cd56902b803d4f7a1f3c718529842823d9e4370a))
+* update stateDelta builder input to Map from ConcurrentMap ([0d1e5c7](https://github.com/google/adk-java/commit/0d1e5c7b0c42cea66b178cf8fedf08a8c20f7fd0))
+
+
+### Bug Fixes
+
+* fix null handling in runAsyncImpl ([567fdf0](https://github.com/google/adk-java/commit/567fdf048fee49afc86ca5d7d35f55424a6016ba))
+* improve processRequest_concurrentReadAndWrite_noException test case ([4eb3613](https://github.com/google/adk-java/commit/4eb3613b65cb1334e9432960d0f864ef09829c23))
+* include saveArtifact invocations in event chain ([551c31f](https://github.com/google/adk-java/commit/551c31f495aafde8568461cc0aa0973d7df7e5ac))
+* prevent ConcurrentModificationException when session events are modified by another thread during iteration ([fca43fb](https://github.com/google/adk-java/commit/fca43fbb9684ec8d080e437761f6bb4e38adf255))
+* Relaxing constraints for output schema ([d7e03ee](https://github.com/google/adk-java/commit/d7e03eeb067b83abd2afa3ea9bb5fc1c16143245))
+* Removing deprecated methods in Runner ([0af82e6](https://github.com/google/adk-java/commit/0af82e61a3c0dbbd95166a10b450cb507115ab60))
+* Use ConcurrentHashMap in InvocationReplayState ([94de7f1](https://github.com/google/adk-java/commit/94de7f199f86b39bdb7cce6e9800eb05008a8953)), closes [#1009](https://github.com/google/adk-java/issues/1009)
+* workaround for the client config streaming settings are not respected ([#983](https://github.com/google/adk-java/issues/983)) ([3ba04d3](https://github.com/google/adk-java/commit/3ba04d33dc8f2ef8b151abe1be4d1c8b7afcc25a))
+
+
+### Miscellaneous Chores
+
+* remove deprecated Example processor ([28a8cd0](https://github.com/google/adk-java/commit/28a8cd04ca9348dbe51a15d2be3a2b5307394174))
+* set version to 1.0.0-rc.1 ([dc5d794](https://github.com/google/adk-java/commit/dc5d794c066571c7d87f006767bd32298e2a3ba8))
+
 ## [0.9.0](https://github.com/google/adk-java/compare/v0.8.0...v0.9.0) (2026-03-13)
 
 
diff --git a/README.md b/README.md
index de1cfbef7..169c78564 100644
--- a/README.md
+++ b/README.md
@@ -50,13 +50,13 @@ If you're using Maven, add the following to your dependencies:
 <dependency>
   <groupId>com.google.adk</groupId>
   <artifactId>google-adk</artifactId>
-  <version>0.9.0</version>
+  <version>1.0.0-rc.1</version>
 </dependency>
 <!-- Dev UI -->
 <dependency>
     <groupId>com.google.adk</groupId>
     <artifactId>google-adk-dev</artifactId>
-    <version>0.9.0</version>
+    <version>1.0.0-rc.1</version>
 </dependency>
 ```
 
diff --git a/a2a/pom.xml b/a2a/pom.xml
index a2f9d9456..bb9d19328 100644
--- a/a2a/pom.xml
+++ b/a2a/pom.xml
@@ -5,7 +5,7 @@
   <parent>
     <groupId>com.google.adk</groupId>
     <artifactId>google-adk-parent</artifactId>
-    <version>0.9.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.0.0-rc.1</version><!-- {x-version-update:google-adk:current} -->
   </parent>
 
   <artifactId>google-adk-a2a</artifactId>
diff --git a/contrib/firestore-session-service/pom.xml b/contrib/firestore-session-service/pom.xml
index 0079dce24..e01ebfeae 100644
--- a/contrib/firestore-session-service/pom.xml
+++ b/contrib/firestore-session-service/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <groupId>com.google.adk</groupId>
         <artifactId>google-adk-parent</artifactId>
-        <version>0.9.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.0.0-rc.1</version><!-- {x-version-update:google-adk:current} -->
         <relativePath>../../pom.xml</relativePath>
     </parent>
 
diff --git a/contrib/langchain4j/pom.xml b/contrib/langchain4j/pom.xml
index 3dd2d1132..10d5d9eb9 100644
--- a/contrib/langchain4j/pom.xml
+++ b/contrib/langchain4j/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <groupId>com.google.adk</groupId>
         <artifactId>google-adk-parent</artifactId>
-        <version>0.9.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.0.0-rc.1</version><!-- {x-version-update:google-adk:current} -->
         <relativePath>../../pom.xml</relativePath>
     </parent>
 
diff --git a/contrib/samples/a2a_basic/pom.xml b/contrib/samples/a2a_basic/pom.xml
index 0eccb733b..22d146c03 100644
--- a/contrib/samples/a2a_basic/pom.xml
+++ b/contrib/samples/a2a_basic/pom.xml
@@ -5,7 +5,7 @@
   <parent>
     <groupId>com.google.adk</groupId>
     <artifactId>google-adk-samples</artifactId>
-    <version>0.9.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.0.0-rc.1</version><!-- {x-version-update:google-adk:current} -->
     <relativePath>..</relativePath>
   </parent>
 
diff --git a/contrib/samples/a2a_server/pom.xml b/contrib/samples/a2a_server/pom.xml
index 0677ad718..8cebc7ef0 100644
--- a/contrib/samples/a2a_server/pom.xml
+++ b/contrib/samples/a2a_server/pom.xml
@@ -5,7 +5,7 @@
   <parent>
     <groupId>com.google.adk</groupId>
     <artifactId>google-adk-samples</artifactId>
-    <version>0.9.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.0.0-rc.1</version><!-- {x-version-update:google-adk:current} -->
     <relativePath>..</relativePath>
   </parent>
 
diff --git a/contrib/samples/configagent/pom.xml b/contrib/samples/configagent/pom.xml
index 059bd8a38..0486fc639 100644
--- a/contrib/samples/configagent/pom.xml
+++ b/contrib/samples/configagent/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <groupId>com.google.adk</groupId>
         <artifactId>google-adk-samples</artifactId>
-        <version>0.9.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.0.0-rc.1</version><!-- {x-version-update:google-adk:current} -->
         <relativePath>..</relativePath>
     </parent>
 
diff --git a/contrib/samples/helloworld/pom.xml b/contrib/samples/helloworld/pom.xml
index df5d5e709..39191782b 100644
--- a/contrib/samples/helloworld/pom.xml
+++ b/contrib/samples/helloworld/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <groupId>com.google.adk</groupId>
         <artifactId>google-adk-samples</artifactId>
-        <version>0.9.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.0.0-rc.1</version><!-- {x-version-update:google-adk:current} -->
         <relativePath>..</relativePath>
     </parent>
 
diff --git a/contrib/samples/mcpfilesystem/pom.xml b/contrib/samples/mcpfilesystem/pom.xml
index 16b139d35..aa1a76333 100644
--- a/contrib/samples/mcpfilesystem/pom.xml
+++ b/contrib/samples/mcpfilesystem/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <groupId>com.google.adk</groupId>
         <artifactId>google-adk-parent</artifactId>
-        <version>0.9.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.0.0-rc.1</version><!-- {x-version-update:google-adk:current} -->
         <relativePath>../../..</relativePath>
     </parent>
 
diff --git a/contrib/samples/pom.xml b/contrib/samples/pom.xml
index 4a415113f..cd96853cb 100644
--- a/contrib/samples/pom.xml
+++ b/contrib/samples/pom.xml
@@ -5,7 +5,7 @@
   <parent>
     <groupId>com.google.adk</groupId>
     <artifactId>google-adk-parent</artifactId>
-    <version>0.9.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.0.0-rc.1</version><!-- {x-version-update:google-adk:current} -->
     <relativePath>../..</relativePath>
   </parent>
 
diff --git a/contrib/spring-ai/pom.xml b/contrib/spring-ai/pom.xml
index 08d237ab5..7e99da1c2 100644
--- a/contrib/spring-ai/pom.xml
+++ b/contrib/spring-ai/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <groupId>com.google.adk</groupId>
         <artifactId>google-adk-parent</artifactId>
-        <version>0.9.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.0.0-rc.1</version><!-- {x-version-update:google-adk:current} -->
         <relativePath>../../pom.xml</relativePath>
     </parent>
 
diff --git a/core/pom.xml b/core/pom.xml
index b3f2f5fd8..3ec8d0be2 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>com.google.adk</groupId>
     <artifactId>google-adk-parent</artifactId>
-    <version>0.9.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.0.0-rc.1</version><!-- {x-version-update:google-adk:current} -->
   </parent>
 
   <artifactId>google-adk</artifactId>
diff --git a/core/src/main/java/com/google/adk/Version.java b/core/src/main/java/com/google/adk/Version.java
index a7aeb8b1f..d6e18c5ad 100644
--- a/core/src/main/java/com/google/adk/Version.java
+++ b/core/src/main/java/com/google/adk/Version.java
@@ -22,7 +22,7 @@
  */
 public final class Version {
   // Don't touch this, release-please should keep it up to date.
-  public static final String JAVA_ADK_VERSION = "0.9.0"; // x-release-please-released-version
+  public static final String JAVA_ADK_VERSION = "1.0.0-rc.1"; // x-release-please-released-version
 
   private Version() {}
 }
diff --git a/dev/pom.xml b/dev/pom.xml
index 6cabcba7c..7f9408ae7 100644
--- a/dev/pom.xml
+++ b/dev/pom.xml
@@ -18,7 +18,7 @@
   <parent>
     <groupId>com.google.adk</groupId>
     <artifactId>google-adk-parent</artifactId>
-    <version>0.9.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.0.0-rc.1</version><!-- {x-version-update:google-adk:current} -->
   </parent>
 
   <artifactId>google-adk-dev</artifactId>
diff --git a/maven_plugin/examples/custom_tools/pom.xml b/maven_plugin/examples/custom_tools/pom.xml
index f2118f9cc..b76d04309 100644
--- a/maven_plugin/examples/custom_tools/pom.xml
+++ b/maven_plugin/examples/custom_tools/pom.xml
@@ -4,7 +4,7 @@
 
     <groupId>com.example</groupId>
     <artifactId>custom-tools-example</artifactId>
-    <version>0.9.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.0.0-rc.1</version><!-- {x-version-update:google-adk:current} -->
     <packaging>jar</packaging>
 
     <name>ADK Custom Tools Example</name>
diff --git a/maven_plugin/examples/simple-agent/pom.xml b/maven_plugin/examples/simple-agent/pom.xml
index 5c0f4462d..e65412ea8 100644
--- a/maven_plugin/examples/simple-agent/pom.xml
+++ b/maven_plugin/examples/simple-agent/pom.xml
@@ -4,7 +4,7 @@
 
     <groupId>com.example</groupId>
     <artifactId>simple-adk-agent</artifactId>
-    <version>0.9.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.0.0-rc.1</version><!-- {x-version-update:google-adk:current} -->
     <packaging>jar</packaging>
 
     <name>Simple ADK Agent Example</name>
diff --git a/maven_plugin/pom.xml b/maven_plugin/pom.xml
index c48331f72..381e03a9e 100644
--- a/maven_plugin/pom.xml
+++ b/maven_plugin/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <groupId>com.google.adk</groupId>
         <artifactId>google-adk-parent</artifactId>
-        <version>0.9.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.0.0-rc.1</version><!-- {x-version-update:google-adk:current} -->
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/pom.xml b/pom.xml
index 0be05a629..368bf67c8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -17,7 +17,7 @@
 
   <groupId>com.google.adk</groupId>
   <artifactId>google-adk-parent</artifactId>
-  <version>0.9.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+  <version>1.0.0-rc.1</version><!-- {x-version-update:google-adk:current} -->
   <packaging>pom</packaging>
 
   <name>Google Agent Development Kit Maven Parent POM</name>
diff --git a/tutorials/city-time-weather/pom.xml b/tutorials/city-time-weather/pom.xml
index 76b7331f3..e2e179e48 100644
--- a/tutorials/city-time-weather/pom.xml
+++ b/tutorials/city-time-weather/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>com.google.adk</groupId>
     <artifactId>google-adk-parent</artifactId>
-    <version>0.9.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.0.0-rc.1</version><!-- {x-version-update:google-adk:current} -->
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/tutorials/live-audio-single-agent/pom.xml b/tutorials/live-audio-single-agent/pom.xml
index a330cf4bd..8b5e97fb5 100644
--- a/tutorials/live-audio-single-agent/pom.xml
+++ b/tutorials/live-audio-single-agent/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>com.google.adk</groupId>
     <artifactId>google-adk-parent</artifactId>
-    <version>0.9.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.0.0-rc.1</version><!-- {x-version-update:google-adk:current} -->
     <relativePath>../../pom.xml</relativePath>
   </parent>