diff --git a/Samples/WebApp/WebApp/packages.config b/Samples/WebApp/WebApp/packages.config
index 0dd32bb..f695505 100644
--- a/Samples/WebApp/WebApp/packages.config
+++ b/Samples/WebApp/WebApp/packages.config
@@ -6,7 +6,7 @@
   <package id="Microsoft.AspNet.WebApi.Core" version="5.2.3" targetFramework="net45" />
   <package id="Microsoft.AspNet.WebApi.Owin" version="5.2.3" targetFramework="net45" />
   <package id="Microsoft.AspNet.WebApi.OwinSelfHost" version="5.2.3" targetFramework="net45" />
-  <package id="Microsoft.Owin" version="3.1.0" targetFramework="net45" />
+  <package id="Microsoft.Owin" version="4.0.0" targetFramework="net45" />
   <package id="Microsoft.Owin.Host.HttpListener" version="3.1.0" targetFramework="net45" />
   <package id="Microsoft.Owin.Hosting" version="3.1.0" targetFramework="net45" />
   <package id="Newtonsoft.Json" version="10.0.3" targetFramework="net45" />