diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 7d268b6ea..1ef3a4257 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -2,6 +2,14 @@
 Changelog
 *********
 
+4.0.5 -- 2026-04-20
+===================
+
+Fixes
+-----------
+* fix: validate encryption materials from cmm are compatible with key commitment policy
+  `#795 <https://github.com/aws/aws-encryption-sdk-python/pull/795>`_
+
 4.0.4 -- 2025-09-03
 ===================
 
diff --git a/src/aws_encryption_sdk/identifiers.py b/src/aws_encryption_sdk/identifiers.py
index 3bd44e299..85cafef6a 100644
--- a/src/aws_encryption_sdk/identifiers.py
+++ b/src/aws_encryption_sdk/identifiers.py
@@ -17,7 +17,7 @@
     # We only actually need these imports when running the mypy checks
     pass
 
-__version__ = "4.0.4"
+__version__ = "4.0.5"
 USER_AGENT_SUFFIX = "AwsEncryptionSdkPython/{}".format(__version__)