diff --git a/FullStockTickerSample/grpc/FullStockTicker/src/TraderSys.FullStockTicker.Client/TraderSys.FullStockTicker.Client.csproj b/FullStockTickerSample/grpc/FullStockTicker/src/TraderSys.FullStockTicker.Client/TraderSys.FullStockTicker.Client.csproj
index 31efd54..ae2723b 100644
--- a/FullStockTickerSample/grpc/FullStockTicker/src/TraderSys.FullStockTicker.Client/TraderSys.FullStockTicker.Client.csproj
+++ b/FullStockTickerSample/grpc/FullStockTicker/src/TraderSys.FullStockTicker.Client/TraderSys.FullStockTicker.Client.csproj
@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.9.1" />
+    <PackageReference Include="Google.Protobuf" Version="3.15.0" />
     <PackageReference Include="Grpc.Auth" Version="2.23.0" />
     <PackageReference Include="Grpc.Net.ClientFactory" Version="0.2.23-pre1" />
     <PackageReference Include="Grpc.Net.Common" Version="0.2.23-pre1" />