diff --git a/CHANGELOG.md b/CHANGELOG.md
index cbb09657..aa201bb7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,19 @@ All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
+
+## [0.23.1] - 2024-06-25
+
+### ⚠️ Breaking Changes
+ - Support MySQL 8.4.0 [#686](https://github.com/cybozu-go/moco/issues/686)
+   - With MySQL 8.4 support, MOCO no longer runs on MySQL 8.0.22 or earlier
+
+### ⚠️ End support for older versions
+ - MySQL versions supported after this release are 8.0.28, 8.0.36, 8.0.37 and 8.4.0
+
+## Added
+ - Add kubectl moco stop/start clustering description [#649](https://github.com/cybozu-go/moco/pull/649)
+
 ## [0.22.1] - 2024-06-21
 
 ## Added
@@ -602,7 +615,8 @@ 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/v0.22.1...HEAD
+[Unreleased]: https://github.com/cybozu-go/moco/compare/v0.23.1...HEAD
+[0.23.1]: https://github.com/cybozu-go/moco/compare/v0.22.2...v0.23.1
 [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
diff --git a/kustomization.yaml b/kustomization.yaml
index 32f9668f..f53607b3 100644
--- a/kustomization.yaml
+++ b/kustomization.yaml
@@ -3,4 +3,4 @@ resources:
 
 images:
 - name: ghcr.io/cybozu-go/moco
-  newTag: 0.21.1
+  newTag: 0.23.1
diff --git a/version.go b/version.go
index 2bfa0929..8c60202d 100644
--- a/version.go
+++ b/version.go
@@ -2,7 +2,7 @@ package moco
 
 const (
 	// Version is the MOCO version
-	Version = "0.21.1"
+	Version = "0.23.1"
 
 	// FluentBitImage is the image for slow-log sidecar container.
 	FluentBitImage = "ghcr.io/cybozu-go/moco/fluent-bit:3.0.2.1"