diff --git a/CHANGELOG.md b/CHANGELOG.md
index 13fc9e83..66983ae0 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]
 
+## [2.21.5] - 2023-10-30
+
 - Update `cargo-llvm-cov@latest` to 0.5.36.
 
 ## [2.21.4] - 2023-10-30
@@ -1389,7 +1391,8 @@ Note: This release is considered a breaking change because installing on version
 
 Initial release
 
-[Unreleased]: https://github.com/taiki-e/install-action/compare/v2.21.4...HEAD
+[Unreleased]: https://github.com/taiki-e/install-action/compare/v2.21.5...HEAD
+[2.21.5]: https://github.com/taiki-e/install-action/compare/v2.21.4...v2.21.5
 [2.21.4]: https://github.com/taiki-e/install-action/compare/v2.21.3...v2.21.4
 [2.21.3]: https://github.com/taiki-e/install-action/compare/v2.21.2...v2.21.3
 [2.21.2]: https://github.com/taiki-e/install-action/compare/v2.21.1...v2.21.2