diff --git a/CHANGELOG.md b/CHANGELOG.md
index e8cf945e..cbb09657 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,15 @@ All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
+## [0.22.1] - 2024-06-21
+
+## Added
+ - MySQLClusters can now be taken offline without deleting data [#659](https://github.com/cybozu-go/moco/issues/659)
+   - Our thanks to [@vsliouniaev](https://github.com/vsliouniaev) for the contribution
+
+ - mysqld_exporter now supports MySQL 8.4 [#686](https://github.com/cybozu-go/moco/issues/686)
+   - MOCO will support MySQL 8.4 from the next version
+
 ## [0.21.1] - 2024-06-13
 
 ### Notable changed:
@@ -593,7 +602,8 @@ The `MySQLCluster` created by MOCO `< v0.5.0` has no compatibility with `>= v0.5
 
 - Bootstrap a vanilla MySQL cluster with no replicas (#2).
 
-[Unreleased]: https://github.com/cybozu-go/moco/compare/v0.21.1...HEAD
+[Unreleased]: https://github.com/cybozu-go/moco/compare/v0.22.1...HEAD
+[0.22.1]: https://github.com/cybozu-go/moco/compare/v0.21.2...v0.22.1
 [0.21.1]: https://github.com/cybozu-go/moco/compare/v0.20.2...v0.21.1
 [0.20.2]: https://github.com/cybozu-go/moco/compare/v0.20.1...v0.20.2
 [0.20.1]: https://github.com/cybozu-go/moco/compare/v0.20.0...v0.20.1