diff --git a/CHANGELOG.md b/CHANGELOG.md
index 33309374..c39a999b 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]
 
+## [2.56.21] - 2025-07-22
+
 - Improve error message for unsupported host architectures.
 
 ## [2.56.20] - 2025-07-22
@@ -4180,7 +4182,8 @@ Note: This release is considered a breaking change because installing on version
 
 Initial release
 
-[Unreleased]: https://github.com/taiki-e/install-action/compare/v2.56.20...HEAD
+[Unreleased]: https://github.com/taiki-e/install-action/compare/v2.56.21...HEAD
+[2.56.21]: https://github.com/taiki-e/install-action/compare/v2.56.20...v2.56.21
 [2.56.20]: https://github.com/taiki-e/install-action/compare/v2.56.19...v2.56.20
 [2.56.19]: https://github.com/taiki-e/install-action/compare/v2.56.18...v2.56.19
 [2.56.18]: https://github.com/taiki-e/install-action/compare/v2.56.17...v2.56.18