diff --git a/uCondition.Core.Models/packages.config b/uCondition.Core.Models/packages.config
index c6c5922..d7d8f5f 100644
--- a/uCondition.Core.Models/packages.config
+++ b/uCondition.Core.Models/packages.config
@@ -18,7 +18,7 @@
   <package id="Microsoft.AspNet.WebApi.Core" version="5.2.3" targetFramework="net452" />
   <package id="Microsoft.AspNet.WebApi.WebHost" version="5.2.3" targetFramework="net452" />
   <package id="Microsoft.AspNet.WebPages" version="3.2.3" targetFramework="net452" />
-  <package id="Microsoft.Owin" version="3.0.1" targetFramework="net452" />
+  <package id="Microsoft.Owin" version="4.0.0" targetFramework="net452" />
   <package id="Microsoft.Owin.Host.SystemWeb" version="3.0.1" targetFramework="net452" />
   <package id="Microsoft.Owin.Security" version="3.0.1" targetFramework="net452" />
   <package id="Microsoft.Owin.Security.Cookies" version="3.0.1" targetFramework="net452" />