diff --git a/section1/GrpcHelloWorld/GrpcGreeterClient/GrpcGreeterClient.csproj b/section1/GrpcHelloWorld/GrpcGreeterClient/GrpcGreeterClient.csproj
index 42afd20..6c3a982 100644
--- a/section1/GrpcHelloWorld/GrpcGreeterClient/GrpcGreeterClient.csproj
+++ b/section1/GrpcHelloWorld/GrpcGreeterClient/GrpcGreeterClient.csproj
@@ -10,7 +10,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.13.0" />
+    <PackageReference Include="Google.Protobuf" Version="3.15.0" />
     <PackageReference Include="Grpc.Net.Client" Version="2.33.1" />
     <PackageReference Include="Grpc.Tools" Version="2.33.1">
       <PrivateAssets>all</PrivateAssets>