diff --git a/Source/Csla.Channels.Grpc/Csla.Channels.Grpc.csproj b/Source/Csla.Channels.Grpc/Csla.Channels.Grpc.csproj
index ac83d66df5..6822d36cb2 100644
--- a/Source/Csla.Channels.Grpc/Csla.Channels.Grpc.csproj
+++ b/Source/Csla.Channels.Grpc/Csla.Channels.Grpc.csproj
@@ -31,7 +31,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.17.3" />
+    <PackageReference Include="Google.Protobuf" Version="3.21.1" />
     <PackageReference Include="Grpc.Net.Client" Version="2.39.0" />
     <PackageReference Include="Grpc.Tools" Version="2.40.0">
       <PrivateAssets>all</PrivateAssets>