diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 8e67d254..38da5b6a 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "6.4.0"
+  ".": "6.4.1"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 26c29074..89c21665 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [6.4.1](https://github.com/adcontextprotocol/adcp-client-python/compare/v6.4.0...v6.4.1) (2026-06-28)
+
+
+### Performance Improvements
+
+* **types:** defer pydantic core-schema builds to cut import memory ([#959](https://github.com/adcontextprotocol/adcp-client-python/issues/959)) ([f418961](https://github.com/adcontextprotocol/adcp-client-python/commit/f4189611740fdc4eaf4e7e514a16e6f17d07598e))
+
 ## [6.4.0](https://github.com/adcontextprotocol/adcp-client-python/compare/v6.3.1...v6.4.0) (2026-06-20)
 
 
diff --git a/pyproject.toml b/pyproject.toml
index bfc581b1..e0c56f91 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "adcp"
-version = "6.4.0"
+version = "6.4.1"
 description = "Official Python client for the Ad Context Protocol (AdCP)"
 authors = [
     {name = "AdCP Community", email = "maintainers@adcontextprotocol.org"}