diff --git a/mvc/demos/PerfSurf/packages.config b/mvc/demos/PerfSurf/packages.config
index cbdd194..488fd3e 100644
--- a/mvc/demos/PerfSurf/packages.config
+++ b/mvc/demos/PerfSurf/packages.config
@@ -17,7 +17,7 @@
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" />
   <package id="Microsoft.Web.Optimization" version="1.0.0-beta" />
   <package id="Modernizr" version="2.0.6" />
-  <package id="Newtonsoft.Json" version="4.0.8" />
+  <package id="Newtonsoft.Json" version="13.0.1" />
   <package id="SignalR" version="0.4.0" />
   <package id="SignalR.Hosting.AspNet" version="0.4.0.0" />
   <package id="SignalR.Js" version="0.4.0.1" />