diff --git a/aspnetcore/demo/DirectorClient/DirectorClient.csproj b/aspnetcore/demo/DirectorClient/DirectorClient.csproj
index 2dbf173..eac726a 100644
--- a/aspnetcore/demo/DirectorClient/DirectorClient.csproj
+++ b/aspnetcore/demo/DirectorClient/DirectorClient.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>