diff --git a/samples/GrpcShared/GrpcShared.csproj b/samples/GrpcShared/GrpcShared.csproj
index 1d30a13..ce2c26c 100644
--- a/samples/GrpcShared/GrpcShared.csproj
+++ b/samples/GrpcShared/GrpcShared.csproj
@@ -14,7 +14,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.11.4" />
+    <PackageReference Include="Google.Protobuf" Version="3.15.0" />
     <PackageReference Include="Grpc.Core" Version="2.27.0" />
     <PackageReference Include="Grpc.Tools" Version="2.27.0" PrivateAssets="All" />
   </ItemGroup>