diff --git a/Technical/keynote/WeatherClientLib/WeatherClientLib.csproj b/Technical/keynote/WeatherClientLib/WeatherClientLib.csproj
index 85691ad..56de7db 100644
--- a/Technical/keynote/WeatherClientLib/WeatherClientLib.csproj
+++ b/Technical/keynote/WeatherClientLib/WeatherClientLib.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.Net.ClientFactory" Version="2.23.1" />
     <PackageReference Include="Grpc.Tools" Version="2.23.0">
       <PrivateAssets>all</PrivateAssets>