diff --git a/ESTM/ESTM.Web/packages.config b/ESTM/ESTM.Web/packages.config
index 30a92f9..a77eb36 100644
--- a/ESTM/ESTM.Web/packages.config
+++ b/ESTM/ESTM.Web/packages.config
@@ -21,7 +21,7 @@
   <package id="Microsoft.AspNet.WebPages" version="3.2.2" targetFramework="net45" />
   <package id="Microsoft.AspNet.WebPages.zh-Hans" version="3.2.2" targetFramework="net45" />
   <package id="Microsoft.jQuery.Unobtrusive.Validation" 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.Host.SystemWeb.zh-Hans" version="3.0.0" targetFramework="net45" />
   <package id="Microsoft.Owin.Security" version="3.0.0" targetFramework="net45" />