diff --git a/CHANGELOG.md b/CHANGELOG.md
index d95f94c..ba40415 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,14 @@ 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).
 
-## [Unreleased](https://git.d3data.de/D3Private/linkmobility-php-client/compare/1.3.0...rel_1.x)
+## [Unreleased](https://git.d3data.de/D3Private/linkmobility-php-client/compare/1.3.1...rel_1.x)
+
+## [1.3.1](https://git.d3data.de/D3Private/linkmobility-php-client/compare/1.3.0...1.3.1) - 2022-07-28
+### Changed
+- improve code quality
+
+### Fixed
+- wrong return type of LoggerHandler::getInstance
 
 ## [1.3.0](https://git.d3data.de/D3Private/linkmobility-php-client/compare/1.2.1...1.3.0) - 2022-07-18
 ### Added