diff --git a/GrpcServer/GrpcServer.csproj b/GrpcServer/GrpcServer.csproj
index 300d4f4..0e6b743 100644
--- a/GrpcServer/GrpcServer.csproj
+++ b/GrpcServer/GrpcServer.csproj
@@ -6,7 +6,7 @@
   </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="Newtonsoft.Json" Version="12.0.1" />
   </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>