diff --git a/CHANGELOG.md b/CHANGELOG.md
index b97e5b01c2b3444511f5c62bd359951470b6468f..00bc63e32dc853f9e4ec39b69a7d0009cd42d49b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Security
 
+## [1.2.1] - 2021-08-04
+
+### Changed
+
+- Use C-Service ServiceWorker v1.2.1
+
 ## [1.2.0] - 2021-07-22
 
 ### Added