diff --git a/CHANGELOG.md b/CHANGELOG.md
index 59978926..febeb8d2 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]
 
+## [1.9.0] - 2022-08-01
+
 - Support `protoc`.
 - Support `shellcheck` on Windows.
 - Support `shfmt` on Windows.
@@ -255,7 +257,8 @@ Note: In this file, do not use the hard wrap in the middle of a sentence for com
 
 Initial release
 
-[Unreleased]: https://github.com/taiki-e/install-action/compare/v1.8.4...HEAD
+[Unreleased]: https://github.com/taiki-e/install-action/compare/v1.9.0...HEAD
+[1.9.0]: https://github.com/taiki-e/install-action/compare/v1.8.4...v1.9.0
 [1.8.4]: https://github.com/taiki-e/install-action/compare/v1.8.3...v1.8.4
 [1.8.3]: https://github.com/taiki-e/install-action/compare/v1.8.2...v1.8.3
 [1.8.2]: https://github.com/taiki-e/install-action/compare/v1.8.1...v1.8.2