diff --git a/docs/en/docs/release-notes.md b/docs/en/docs/release-notes.md
index b0ce25e..af803fb 100644
--- a/docs/en/docs/release-notes.md
+++ b/docs/en/docs/release-notes.md
@@ -5,6 +5,15 @@ hide:
 
 # Release Notes
 
+## 0.11.9
+
+### Added
+
+- Add `session_serializer`, `session_deserializer` parameters to `SessionMiddleware`.
+
+### Changed
+
+- Refactor `SessionMiddleware`.
 
 ## 0.11.8