diff --git a/CSharp/WebForms/WebForms/packages.config b/CSharp/WebForms/WebForms/packages.config
index a420a9b4..70beb9ca 100644
--- a/CSharp/WebForms/WebForms/packages.config
+++ b/CSharp/WebForms/WebForms/packages.config
@@ -24,7 +24,7 @@
   <package id="Microsoft.Owin.Security.Cookies" version="3.0.1" targetFramework="net452" />
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net452" />
   <package id="Modernizr" version="2.6.2" targetFramework="net452" />
-  <package id="Newtonsoft.Json" version="11.0.2" targetFramework="net452" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net452" />
   <package id="Owin" version="1.0" targetFramework="net452" />
   <package id="Respond" version="1.4.2" targetFramework="net452" />
   <package id="System.ComponentModel.Annotations" version="4.4.1" targetFramework="net452" />