diff --git a/GrpcGreeterClient/GrpcGreeterClient.csproj b/GrpcGreeterClient/GrpcGreeterClient.csproj
index 1fa51dc..df5efa1 100644
--- a/GrpcGreeterClient/GrpcGreeterClient.csproj
+++ b/GrpcGreeterClient/GrpcGreeterClient.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.Client" Version="0.1.22-pre2" />
     <PackageReference Include="Grpc.Tools" Version="1.22.0">
       <PrivateAssets>all</PrivateAssets>