diff --git a/CHANGELOG.md b/CHANGELOG.md
index 36249fd..73afa11 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,12 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/) and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [2.2.5] - 2017-10-02
+
+### Fixed
+
+- Fix concurrency issue in object related methods
+
 ## [2.2.4] - 2017-09-05
 
 ### Added
@@ -161,6 +167,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 
 - Provide Official Qingstor SDK for Python
 
+[2.2.5]: https://github.com/yunify/qingstor-sdk-python/compare/2.2.4...2.2.5
 [2.2.4]: https://github.com/yunify/qingstor-sdk-python/compare/2.2.3...2.2.4
 [2.2.3]: https://github.com/yunify/qingstor-sdk-python/compare/2.2.2...2.2.3
 [2.2.2]: https://github.com/yunify/qingstor-sdk-python/compare/2.2.1...2.2.2
diff --git a/qingstor/sdk/__init__.py b/qingstor/sdk/__init__.py
index 01a685d..8eccb56 100644
--- a/qingstor/sdk/__init__.py
+++ b/qingstor/sdk/__init__.py
@@ -15,4 +15,4 @@
 # +-------------------------------------------------------------------------
 # -*- coding: utf-8 -*-
 
-__version__ = '2.2.4'
+__version__ = '2.2.5'