diff --git a/CHANGELOG-PRERELEASE.md b/CHANGELOG-PRERELEASE.md
index 337a72b6..e0027878 100644
--- a/CHANGELOG-PRERELEASE.md
+++ b/CHANGELOG-PRERELEASE.md
@@ -19,6 +19,7 @@ The format is based on [Keep a Changelog].
 
 ### Security
 
+## [1.8.1] - 2024-12-01
 ## [1.8.1-beta.1] - 2024-11-30
 ### Fixed
 - Optimize Texture may break liltoon outline mask [`#1357`](https://github.com/anatawa12/AvatarOptimizer/pull/1357)
@@ -1795,7 +1796,8 @@ This release is mistake.
 - Merge Bone
 - Clear Endpoint Position
 
-[Unreleased]: https://github.com/anatawa12/AvatarOptimizer/compare/v1.8.1-beta.1...HEAD
+[Unreleased]: https://github.com/anatawa12/AvatarOptimizer/compare/v1.8.1...HEAD
+[1.8.1]: https://github.com/anatawa12/AvatarOptimizer/compare/v1.8.1-beta.1...v1.8.1
 [1.8.1-beta.1]: https://github.com/anatawa12/AvatarOptimizer/compare/v1.8.0...v1.8.1-beta.1
 [1.8.0]: https://github.com/anatawa12/AvatarOptimizer/compare/v1.8.0-rc.11...v1.8.0
 [1.8.0-rc.11]: https://github.com/anatawa12/AvatarOptimizer/compare/v1.8.0-rc.10...v1.8.0-rc.11
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 178b71aa..1dcf9863 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,10 +16,13 @@ The format is based on [Keep a Changelog].
 ### Removed
 
 ### Fixed
-- Optimize Texture may break liltoon outline mask `#1357`
 
 ### Security
 
+## [1.8.1] - 2024-12-01
+### Fixed
+- Optimize Texture may break liltoon outline mask [`#1357`](https://github.com/anatawa12/AvatarOptimizer/pull/1357)
+
 ## [1.8.0] - 2024-11-30
 ### Added
 - AnyState to Entry/Exit optimization in Optimize Animator [`#1157`](https://github.com/anatawa12/AvatarOptimizer/pull/1157)
@@ -1131,7 +1134,8 @@ The format is based on [Keep a Changelog].
 - Merge Bone
 - Clear Endpoint Position
 
-[Unreleased]: https://github.com/anatawa12/AvatarOptimizer/compare/v1.8.0...HEAD
+[Unreleased]: https://github.com/anatawa12/AvatarOptimizer/compare/v1.8.1...HEAD
+[1.8.1]: https://github.com/anatawa12/AvatarOptimizer/compare/v1.8.0...v1.8.1
 [1.8.0]: https://github.com/anatawa12/AvatarOptimizer/compare/v1.7.13...v1.8.0
 [1.7.13]: https://github.com/anatawa12/AvatarOptimizer/compare/v1.7.12...v1.7.13
 [1.7.12]: https://github.com/anatawa12/AvatarOptimizer/compare/v1.7.11...v1.7.12
diff --git a/package.json b/package.json
index d1c30890..b9091ed9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "com.anatawa12.avatar-optimizer",
-  "version": "1.8.1-beta.1",
+  "version": "1.8.1",
   "private": false,
   "private-beta": false,
   "unity": "2022.3",