diff --git a/BasicCalculator/gRPC/src/BasicCalculatorCore.Client/BasicCalculatorCore.Client.csproj b/BasicCalculator/gRPC/src/BasicCalculatorCore.Client/BasicCalculatorCore.Client.csproj
index 55211d9..258ba47 100644
--- a/BasicCalculator/gRPC/src/BasicCalculatorCore.Client/BasicCalculatorCore.Client.csproj
+++ b/BasicCalculator/gRPC/src/BasicCalculatorCore.Client/BasicCalculatorCore.Client.csproj
@@ -3,7 +3,7 @@
     <TargetFrameworks>netstandard2.1;net45</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.11.2" />
+    <PackageReference Include="Google.Protobuf" Version="3.15.0" />
     <PackageReference Include="Grpc.Tools" Version="2.26.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>