diff --git a/CHANGELOG.md b/CHANGELOG.md
index af1a1e7..697bcd4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,17 @@
 # Changelog
 
+## [1.6.4] - 2026-04-23
+
+### Added
+- feat: add utility methods for primitive clients (#424) (d3537c6)
+
+### Fixed
+- fix: use correct score field for relevance filtering in retrieve_customer_context (#415) (e632e9d)
+- fix: implement update_message() for guardrail redaction support (#388) (9ba4512)
+
+### Other Changes
+- fix(converters): prepend reasoningContent blocks in _openai_to_bedrock() (#419) (667ef55)
+
 ## [1.6.3] - 2026-04-16
 
 ### Fixed
diff --git a/pyproject.toml b/pyproject.toml
index 7ed78e7..37f4f92 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "bedrock-agentcore"
-version = "1.6.3"
+version = "1.6.4"
 description = "An SDK for using Bedrock AgentCore"
 readme = "README.md"
 requires-python = ">=3.10"
diff --git a/uv.lock b/uv.lock
index 771e7f1..fd65324 100644
--- a/uv.lock
+++ b/uv.lock
@@ -270,7 +270,7 @@ wheels = [
 
 [[package]]
 name = "bedrock-agentcore"
-version = "1.6.3"
+version = "1.6.4"
 source = { editable = "." }
 dependencies = [
     { name = "boto3" },