diff --git a/CHANGELOG.md b/CHANGELOG.md
index c7bf5908..7c16e82b 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]
 
+## [2.15.6] - 2023-08-19
+
 - Update `protoc@latest` to 3.24.1.
 
 ## [2.15.5] - 2023-08-18
@@ -1085,7 +1087,8 @@ Note: This release is considered a breaking change because installing on version
 
 Initial release
 
-[Unreleased]: https://github.com/taiki-e/install-action/compare/v2.15.5...HEAD
+[Unreleased]: https://github.com/taiki-e/install-action/compare/v2.15.6...HEAD
+[2.15.6]: https://github.com/taiki-e/install-action/compare/v2.15.5...v2.15.6
 [2.15.5]: https://github.com/taiki-e/install-action/compare/v2.15.4...v2.15.5
 [2.15.4]: https://github.com/taiki-e/install-action/compare/v2.15.3...v2.15.4
 [2.15.3]: https://github.com/taiki-e/install-action/compare/v2.15.2...v2.15.3