diff --git a/src/code-listings/lesson-37/FSharpWeb/packages.config b/src/code-listings/lesson-37/FSharpWeb/packages.config
index 1dabfd8..1c20aa9 100644
--- a/src/code-listings/lesson-37/FSharpWeb/packages.config
+++ b/src/code-listings/lesson-37/FSharpWeb/packages.config
@@ -7,6 +7,6 @@
   <package id="Microsoft.Owin" version="3.0.0" targetFramework="net45" />
   <package id="Microsoft.Owin.Host.SystemWeb" version="3.0.0" targetFramework="net45" />
   <package id="MSBuild.Extension.Pack" version="1.3.0" targetFramework="net45" />
-  <package id="Newtonsoft.Json" version="6.0.4" targetFramework="net45" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net45" />
   <package id="Owin" version="1.0" targetFramework="net45" />
 </packages>
\ No newline at end of file