diff --git a/DotNetCore3_0/GrpcService.Demo/GrpcService.Client/GrpcService.Client.csproj b/DotNetCore3_0/GrpcService.Demo/GrpcService.Client/GrpcService.Client.csproj
index f4c6878..8c7a77b 100644
--- a/DotNetCore3_0/GrpcService.Demo/GrpcService.Client/GrpcService.Client.csproj
+++ b/DotNetCore3_0/GrpcService.Demo/GrpcService.Client/GrpcService.Client.csproj
@@ -6,7 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.9.1" />
+    <PackageReference Include="Google.Protobuf" Version="3.15.0" />
     <PackageReference Include="Grpc.Net.ClientFactory" Version="2.23.2" />
     <PackageReference Include="Grpc.Tools" Version="2.23.0">
       <PrivateAssets>all</PrivateAssets>