diff --git a/RELEASE.CHANGELOG.md b/RELEASE.CHANGELOG.md
index fc45791..d46101c 100644
--- a/RELEASE.CHANGELOG.md
+++ b/RELEASE.CHANGELOG.md
@@ -1,3 +1,7 @@
+### Feb 20, 2026
+`4.0.0`
+- Add Lambda Managed Instances (LMI) / Multi-Concurrent Support ([#200](https://github.com/aws/aws-lambda-python-runtime-interface-client/pull/200))
+
 ### May 26, 2025
 `3.1.1`
 - Move unhandled exception warning message to init errors. ([#189](https://github.com/aws/aws-lambda-python-runtime-interface-client/pull/189))
diff --git a/awslambdaric/__init__.py b/awslambdaric/__init__.py
index 5605903..0d6f729 100644
--- a/awslambdaric/__init__.py
+++ b/awslambdaric/__init__.py
@@ -2,4 +2,4 @@
 Copyright 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 """
 
-__version__ = "3.1.1"
+__version__ = "4.0.0"