diff --git a/examples/CodeFirst/MathClient/MathClient.csproj b/examples/CodeFirst/MathClient/MathClient.csproj
index bbbc1d3..b6cef90 100644
--- a/examples/CodeFirst/MathClient/MathClient.csproj
+++ b/examples/CodeFirst/MathClient/MathClient.csproj
@@ -6,7 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.6.1" />
+    <PackageReference Include="Google.Protobuf" Version="3.15.0" />
     <PackageReference Include="Grpc.Core" Version="2.24.0" />
   </ItemGroup>