diff --git a/Source/Csla.Channels.Grpc/Csla.Channels.Grpc.csproj b/Source/Csla.Channels.Grpc/Csla.Channels.Grpc.csproj
index ae669e399a..110990a51c 100644
--- a/Source/Csla.Channels.Grpc/Csla.Channels.Grpc.csproj
+++ b/Source/Csla.Channels.Grpc/Csla.Channels.Grpc.csproj
@@ -20,7 +20,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.20.0" />
+    <PackageReference Include="Google.Protobuf" Version="3.21.1" />
     <PackageReference Include="Grpc.Net.Client" Version="2.44.0" />
     <PackageReference Include="Grpc.Tools" Version="2.45.0" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All" />