diff --git a/CHANGELOG.md b/CHANGELOG.md
index b2dfae5..e147a5c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,8 @@
 <!--- DO NOT EDIT THIS FILE - IT'S AUTOMATICALLY GENERATED VIA DEVTOOLS --->
 
-## unreleased 
+## 0.4.0 2021-12-23
 
+This is a big update - please also read dry-system [CHANGELOG](https://github.com/dry-rb/dry-system/blob/master/CHANGELOG.md) versions 0.20 and 0.21.
 
 ### Added
 
@@ -15,7 +16,7 @@
 
 - Updated to work with dry-system 0.21 (via #48 and #50) (@zlw + @solnic)
 
-[Compare v0.3.0...master](https://github.com/dry-rb/dry-rails/compare/v0.3.0...master)
+[Compare v0.3.0...v0.4.0](https://github.com/dry-rb/dry-rails/compare/v0.3.0...v0.4.0)
 
 ## 0.3.0 2020-08-26