diff --git a/CHANGELOG.md b/CHANGELOG.md
index caf932c13649fdff840dc141ebda4ba673b11d5a..58b844605038858311e75a54b9b6c0af34bf6145 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,10 @@
 
+<a name="v3.40.0"></a>
+## [v3.40.0] - 2023-04-03
+### Add Features
+- attribure observer
+
+
 <a name="v3.39.1"></a>
 ## [v3.39.1] - 2023-04-03
 ### Bug Fixes
@@ -557,6 +563,7 @@
 <a name="1.8.0"></a>
 ## 1.8.0 - 2021-08-15
 
+[v3.40.0]: https://gitlab.schukai.com/oss/libraries/javascript/monster/compare/v3.39.1...v3.40.0
 [v3.39.1]: https://gitlab.schukai.com/oss/libraries/javascript/monster/compare/v3.39.0...v3.39.1
 [v3.39.0]: https://gitlab.schukai.com/oss/libraries/javascript/monster/compare/v3.38.1...v3.39.0
 [v3.38.1]: https://gitlab.schukai.com/oss/libraries/javascript/monster/compare/v3.38.0...v3.38.1