diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9a02f50..dd0e506 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,8 +5,8 @@ All notable changes to this project will be documented in this file.
 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).
 
-## [not yet released]
-- no changes yet
+## 2024-09-26 - release 1.2.1
+- fix StatisticsWriter division by zero problem and remove dependency to demo application with benchmark results.  
 
 ## 2024-09-26 - release 1.2.0
 - add prometheus interface and configuration
diff --git a/version.txt b/version.txt
index e920547..6085e94 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-1.2.1-SNAPSHOT
+1.2.1