diff --git a/Chapter06/TodoListService/packages.config b/Chapter06/TodoListService/packages.config
index 586d10c..3d6772d 100644
--- a/Chapter06/TodoListService/packages.config
+++ b/Chapter06/TodoListService/packages.config
@@ -12,7 +12,7 @@
   <package id="Microsoft.AspNet.WebApi.HelpPage" version="5.2.2" targetFramework="net45" />
   <package id="Microsoft.AspNet.WebApi.WebHost" version="5.2.2" targetFramework="net45" />
   <package id="Microsoft.AspNet.WebPages" version="3.2.2" targetFramework="net45" />
-  <package id="Microsoft.Owin" version="3.0.0" targetFramework="net45" />
+  <package id="Microsoft.Owin" version="4.0.0" targetFramework="net45" />
   <package id="Microsoft.Owin.Host.SystemWeb" version="3.0.0" targetFramework="net45" />
   <package id="Microsoft.Owin.Security" version="3.0.0" targetFramework="net45" />
   <package id="Microsoft.Owin.Security.ActiveDirectory" version="3.0.0" targetFramework="net45" />