diff --git a/Tests/MVC461/packages.config b/Tests/MVC461/packages.config
index 06eeff4b..923f3445 100644
--- a/Tests/MVC461/packages.config
+++ b/Tests/MVC461/packages.config
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="BouncyCastle" version="1.8.3.1" targetFramework="net461" />
-  <package id="Google.Protobuf" version="3.6.1" targetFramework="net461" />
+  <package id="Google.Protobuf" version="3.15.0" targetFramework="net461" />
   <package id="JWT" version="6.1.0" targetFramework="net461" />
   <package id="log4net" version="2.0.12" targetFramework="net461" />
   <package id="Microsoft.AspNet.WebApi" version="5.2.6" targetFramework="net461" />