diff --git a/ch11/ch11-webapi-vs2017/src/WebApi.NetFx/packages.config b/ch11/ch11-webapi-vs2017/src/WebApi.NetFx/packages.config
index 5c34c34..b088a35 100644
--- a/ch11/ch11-webapi-vs2017/src/WebApi.NetFx/packages.config
+++ b/ch11/ch11-webapi-vs2017/src/WebApi.NetFx/packages.config
@@ -16,7 +16,7 @@
   <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="2.0.0" targetFramework="net472" />
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net472" />
   <package id="Modernizr" version="2.8.3" targetFramework="net472" />
-  <package id="Newtonsoft.Json" version="11.0.1" targetFramework="net472" />
+  <package id="Newtonsoft.Json" version="13.0.2" targetFramework="net472" />
   <package id="System.Diagnostics.DiagnosticSource" version="4.4.1" targetFramework="net472" />
   <package id="WebGrease" version="1.6.0" targetFramework="net472" />
 </packages>
\ No newline at end of file