diff --git a/source/Tests/UnitTests/packages.config b/source/Tests/UnitTests/packages.config
index d1ddee664..cb8d0edcb 100644
--- a/source/Tests/UnitTests/packages.config
+++ b/source/Tests/UnitTests/packages.config
@@ -5,7 +5,7 @@
   <package id="Microsoft.AspNet.Cors" version="5.2.3" targetFramework="net45" />
   <package id="Microsoft.AspNet.WebApi.Client" version="5.2.3" targetFramework="net45" />
   <package id="Microsoft.AspNet.WebApi.Core" 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.Cors" version="3.0.1" targetFramework="net45" />
   <package id="Microsoft.Owin.Hosting" version="3.0.1" targetFramework="net45" />
   <package id="Microsoft.Owin.Security" version="3.0.1" targetFramework="net45" />