diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9274ea8..c6fac89 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,16 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 Generated by [`auto-changelog`](https://github.com/CookPete/auto-changelog).
 
+## [v5.4.22](https://github.com/tencentyun/qcloud-sdk-dotnet/compare/v5.4.21...v5.4.22) - 2021-08-13
+
+support Append, fix resumable download
+
+### Commits
+
+- support AppendObject, fix resumable download problem, add SetRegion check [`19baca5`](https://github.com/tencentyun/qcloud-sdk-dotnet/commit/19baca5f31756ef2952361ed5937f09186518664)
+- restore some unitTest setting [`da9290d`](https://github.com/tencentyun/qcloud-sdk-dotnet/commit/da9290d576721736a174a34937f6afb85e312f62)
+- Updated CHANGELOG.md [`8522c42`](https://github.com/tencentyun/qcloud-sdk-dotnet/commit/8522c42fb65fa1d73937445deca581cd23b95ae2)
+
 ## [v5.4.21](https://github.com/tencentyun/qcloud-sdk-dotnet/compare/v5.4.19...v5.4.21) - 2021-07-01
 
 修复部分请求签名错误问题
diff --git a/QCloudCSharpSDK/COSXML/COSXML.csproj b/QCloudCSharpSDK/COSXML/COSXML.csproj
index 0314ea5..fb21fab 100644
--- a/QCloudCSharpSDK/COSXML/COSXML.csproj
+++ b/QCloudCSharpSDK/COSXML/COSXML.csproj
@@ -519,4 +519,5 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
\ No newline at end of file
+</Project>
+
diff --git a/QCloudCSharpSDK/COSXML/Common/CosVersion.cs b/QCloudCSharpSDK/COSXML/Common/CosVersion.cs
index dd5d09c..a0323b0 100644
--- a/QCloudCSharpSDK/COSXML/Common/CosVersion.cs
+++ b/QCloudCSharpSDK/COSXML/Common/CosVersion.cs
@@ -9,7 +9,11 @@ namespace COSXML.Common
 {
     public sealed class CosVersion
     {
+<<<<<<< HEAD
         private static string SDKVersion = "5.4.24.0";
+=======
+        private static string SDKVersion = "5.4.23.0";
+>>>>>>> upstream/master
 
         public static string GetUserAgent()
         {