diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3e05d5fe..bf7861f7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,8 @@ Note: In this file, do not use the hard wrap in the middle of a sentence for com
 
 ## [Unreleased]
 
+## [2.21.21] - 2023-11-28
+
 - Update `biome@latest` to 1.4.0.
 
 ## [2.21.20] - 2023-11-27
@@ -1459,7 +1461,8 @@ Note: This release is considered a breaking change because installing on version
 
 Initial release
 
-[Unreleased]: https://github.com/taiki-e/install-action/compare/v2.21.20...HEAD
+[Unreleased]: https://github.com/taiki-e/install-action/compare/v2.21.21...HEAD
+[2.21.21]: https://github.com/taiki-e/install-action/compare/v2.21.20...v2.21.21
 [2.21.20]: https://github.com/taiki-e/install-action/compare/v2.21.19...v2.21.20
 [2.21.19]: https://github.com/taiki-e/install-action/compare/v2.21.18...v2.21.19
 [2.21.18]: https://github.com/taiki-e/install-action/compare/v2.21.17...v2.21.18