diff --git a/src/GrpcGreeterClient-withAuth/GrpcGreeterClient-withAuth.csproj b/src/GrpcGreeterClient-withAuth/GrpcGreeterClient-withAuth.csproj
index e546493..415ac8a 100644
--- a/src/GrpcGreeterClient-withAuth/GrpcGreeterClient-withAuth.csproj
+++ b/src/GrpcGreeterClient-withAuth/GrpcGreeterClient-withAuth.csproj
@@ -6,7 +6,7 @@
     <RootNamespace>GrpcGreeterClient_withAuth</RootNamespace>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.10.0-rc1" />
+    <PackageReference Include="Google.Protobuf" Version="3.15.0" />
     <PackageReference Include="Grpc.Net.Client" Version="2.23.2" />
     <PackageReference Include="Grpc.Reflection" Version="2.24.0-pre1" />
     <PackageReference Include="Grpc.Tools" Version="2.24.0-pre1" PrivateAssets="All" />