diff --git a/GrpcHost/Contracts/Contracts.csproj b/GrpcHost/Contracts/Contracts.csproj
index 7d83a14..1c309ad 100644
--- a/GrpcHost/Contracts/Contracts.csproj
+++ b/GrpcHost/Contracts/Contracts.csproj
@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.7.0" />
+    <PackageReference Include="Google.Protobuf" Version="3.12.3" />
     <PackageReference Include="Google.Protobuf.Tools" Version="3.7.0" />
     <PackageReference Include="Grpc" Version="1.19.0" />
     <PackageReference Include="Grpc.Reflection" Version="1.19.0" />
diff --git a/GrpcHost/GrpcApp/GrpcServer.csproj b/GrpcHost/GrpcApp/GrpcServer.csproj
index 3dc1b88..4ff1785 100644
--- a/GrpcHost/GrpcApp/GrpcServer.csproj
+++ b/GrpcHost/GrpcApp/GrpcServer.csproj
@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.7.0" />
+    <PackageReference Include="Google.Protobuf" Version="3.12.3" />
     <PackageReference Include="Grpc.Core" Version="1.19.0" />
     <PackageReference Include="Microsoft.Extensions.Hosting" Version="2.2.0" />
   </ItemGroup>