diff --git a/WebAPI/WebAPI/packages.config b/WebAPI/WebAPI/packages.config
index 52dfbb4..6d44f2b 100644
--- a/WebAPI/WebAPI/packages.config
+++ b/WebAPI/WebAPI/packages.config
@@ -18,7 +18,7 @@
   <package id="Microsoft.AspNet.WebApi.HelpPage" version="5.0.0" targetFramework="net45" />
   <package id="Microsoft.AspNet.WebApi.WebHost" version="5.2.3" targetFramework="net45" />
   <package id="Microsoft.AspNet.WebPages" version="3.0.0" 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.Cors" version="3.1.0" targetFramework="net45" />
   <package id="Microsoft.Owin.Host.SystemWeb" version="3.1.0" targetFramework="net45" />
   <package id="Microsoft.Owin.Security" version="2.1.0" targetFramework="net45" />