diff --git a/GrpcClient/GrpcClient.csproj b/GrpcClient/GrpcClient.csproj
index 1d871a1..d0fb0f7 100644
--- a/GrpcClient/GrpcClient.csproj
+++ b/GrpcClient/GrpcClient.csproj
@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.7.0" />
+    <PackageReference Include="Google.Protobuf" Version="3.15.0" />
     <PackageReference Include="Grpc" Version="1.19.0" />
   </ItemGroup>
 
diff --git a/Message/Message.csproj b/Message/Message.csproj
index eb5ab29..eaccb31 100644
--- a/Message/Message.csproj
+++ b/Message/Message.csproj
@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.7.0" />
+    <PackageReference Include="Google.Protobuf" Version="3.15.0" />
     <PackageReference Include="Grpc" Version="1.19.0" />
     <PackageReference Include="Grpc.Tools" Version="1.19.0">
       <PrivateAssets>all</PrivateAssets>