diff --git a/src/Practice/CozyAnonymous.WebSite/packages.config b/src/Practice/CozyAnonymous.WebSite/packages.config
index 7570469bf..792423e93 100644
--- a/src/Practice/CozyAnonymous.WebSite/packages.config
+++ b/src/Practice/CozyAnonymous.WebSite/packages.config
@@ -7,7 +7,7 @@
   <package id="Microsoft.AspNet.SignalR.SystemWeb" version="2.2.0" targetFramework="net452" />
   <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="1.0.0" targetFramework="net452" />
   <package id="Microsoft.Net.Compilers" version="1.0.0" targetFramework="net452" developmentDependency="true" />
-  <package id="Microsoft.Owin" version="2.1.0" targetFramework="net452" />
+  <package id="Microsoft.Owin" version="4.0.0" targetFramework="net452" />
   <package id="Microsoft.Owin.Host.SystemWeb" version="2.1.0" targetFramework="net452" />
   <package id="Microsoft.Owin.Security" version="2.1.0" targetFramework="net452" />
   <package id="Nancy" version="1.4.2" targetFramework="net452" />