diff --git a/csharp/rocketmq-client-csharp/rocketmq-client-csharp.csproj b/csharp/rocketmq-client-csharp/rocketmq-client-csharp.csproj
index 27b27a8..46a1ad4 100644
--- a/csharp/rocketmq-client-csharp/rocketmq-client-csharp.csproj
+++ b/csharp/rocketmq-client-csharp/rocketmq-client-csharp.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
         <PackageId>RocketMQ.Client</PackageId>
-        <PackageVersion>5.1.0</PackageVersion>
+        <PackageVersion>5.1.1-rc1</PackageVersion>
         <Version>$(PackageVersion)</Version>
 
         <Authors>RocketMQ Authors</Authors>