diff --git a/src/Core/Terratype/packages.config b/src/Core/Terratype/packages.config
index 7df6cf2e..c58a6873 100644
--- a/src/Core/Terratype/packages.config
+++ b/src/Core/Terratype/packages.config
@@ -19,7 +19,7 @@
   <package id="Microsoft.AspNet.WebApi.WebHost" version="5.2.3" targetFramework="net45" developmentDependency="true" />
   <package id="Microsoft.AspNet.WebPages" version="3.2.3" targetFramework="net45" developmentDependency="true" />
   <package id="Microsoft.IO.RecyclableMemoryStream" version="1.2.1" targetFramework="net45" developmentDependency="true" />
-  <package id="Microsoft.Owin" version="3.0.1" targetFramework="net45" developmentDependency="true" />
+  <package id="Microsoft.Owin" version="4.0.0" targetFramework="net45" developmentDependency="true" />
   <package id="Microsoft.Owin.Host.SystemWeb" version="3.0.1" targetFramework="net45" developmentDependency="true" />
   <package id="Microsoft.Owin.Security" version="3.0.1" targetFramework="net45" developmentDependency="true" />
   <package id="Microsoft.Owin.Security.Cookies" version="3.0.1" targetFramework="net45" developmentDependency="true" />