diff --git a/src/formulate.deploy/packages.config b/src/formulate.deploy/packages.config
index 4296e61c..dd0b7be0 100644
--- a/src/formulate.deploy/packages.config
+++ b/src/formulate.deploy/packages.config
@@ -26,7 +26,7 @@
   <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.IO.RecyclableMemoryStream" version="1.2.2" targetFramework="net452" />
-  <package id="Microsoft.Owin" version="3.1.0" targetFramework="net452" />
+  <package id="Microsoft.Owin" version="4.0.0" targetFramework="net452" />
   <package id="Microsoft.Owin.Cors" version="3.0.1" targetFramework="net452" />
   <package id="Microsoft.Owin.Host.SystemWeb" version="3.1.0" targetFramework="net452" />
   <package id="Microsoft.Owin.Security" version="3.1.0" targetFramework="net452" />