diff --git a/WebApiTest_Authorized/Web.Api.Tests/packages.config b/WebApiTest_Authorized/Web.Api.Tests/packages.config
index 1ee00f7..02e0e31 100644
--- a/WebApiTest_Authorized/Web.Api.Tests/packages.config
+++ b/WebApiTest_Authorized/Web.Api.Tests/packages.config
@@ -4,7 +4,7 @@
   <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="3.0.1" targetFramework="net45" />
+  <package id="Microsoft.Owin" version="4.0.0" targetFramework="net45" />
   <package id="Microsoft.Owin.Host.HttpListener" version="2.0.2" targetFramework="net45" />
   <package id="Microsoft.Owin.Hosting" version="3.0.1" targetFramework="net45" />
   <package id="Microsoft.Owin.Testing" version="3.0.1" targetFramework="net45" />