diff --git a/examples/csharp/route_guide/RouteGuideServer/packages.config b/examples/csharp/route_guide/RouteGuideServer/packages.config
index dd498f48ea34a..bf22855ba882f 100644
--- a/examples/csharp/route_guide/RouteGuideServer/packages.config
+++ b/examples/csharp/route_guide/RouteGuideServer/packages.config
@@ -1,6 +1,6 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Google.Protobuf" version="3.0.0" targetFramework="net45" />
+  <package id="Google.Protobuf" version="3.15.0" targetFramework="net45" />
   <package id="Grpc" version="1.0.1" targetFramework="net45" />
   <package id="Grpc.Core" version="1.0.1" targetFramework="net45" />
   <package id="System.Interactive.Async" version="3.0.0" targetFramework="net45" />