diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5f997f5..7c928cf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+
+## [6.21.0] - 2024-11-04
 ### Fixed
 - Unit Test improvements: report underlying unit tests errors, always run test cases in a sub-test, always use test suite functions, use more specific assert functions where possible.
 - General spelling and grammar corrections everywhere.