diff --git a/CHANGELOG.md b/CHANGELOG.md
index df3d0882..1cfff1b1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+
+# [4.0.0] - 2021-09-10
 ### Added
 - AniMe:
   + Support 8bit RGB, RGBA, 16bit Greyscalw, RGB, RGBA