diff --git a/CHANGELOG.md b/CHANGELOG.md
index 49c57c3..a8bf94e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,11 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 
+## [2.12.1] - 2024-05-31
+
+### Fixed
+
+- Transfer Content Encoding might not be a lowered case string when reading part
 
 
 ## [2.12.0] - 2024-03-18