diff --git a/CHANGELOG.md b/CHANGELOG.md
index 61c09e2c..3275b71f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,11 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/) and this project adheres to [Semantic Versioning](http://semver.org/).
 
-## [Next-Release]
+## [2.2.1] - 2022-2-3
+
+### Fixed
+
+- Backport of fix for [#167](https://github.com/team-charls/charls/issues/167), Decoding\Encoding fails on IBM s390x CPU (Big Endian architecture).
 
 ## [2.2.0] - 2021-1-10
 
diff --git a/SECURITY.md b/SECURITY.md
index 322c3c84..0c6244ea 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -4,7 +4,8 @@
 
 | Version | Supported          |
 | ------- | ------------------ |
-| 2.2.0   | :white_check_mark: |
+| 2.2.1   | :white_check_mark: |
+| 2.2.0   | :x:                |
 | 2.1.0   | :x:                |
 | 2.0.0   | :x:                |
 | 1.1.0   | :x:                |