diff --git a/Greeter/Greeter.csproj b/Greeter/Greeter.csproj
index f91df9d..f11f2cc 100644
--- a/Greeter/Greeter.csproj
+++ b/Greeter/Greeter.csproj
@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.8.0" />
+    <PackageReference Include="Google.Protobuf" Version="3.15.0" />
     <PackageReference Include="Grpc" Version="1.22.0" />
     <PackageReference Include="Grpc.Tools" Version="1.22.0">
       <PrivateAssets>all</PrivateAssets>