diff --git a/tests/EpiCategories.SandboxApp/packages.config b/tests/EpiCategories.SandboxApp/packages.config
index 25daa1c..56d04c3 100644
--- a/tests/EpiCategories.SandboxApp/packages.config
+++ b/tests/EpiCategories.SandboxApp/packages.config
@@ -25,7 +25,7 @@
   <package id="Microsoft.AspNet.Razor" version="3.2.3" targetFramework="net48" />
   <package id="Microsoft.AspNet.Web.Optimization" version="1.1.3" targetFramework="net48" />
   <package id="Microsoft.AspNet.WebPages" version="3.2.3" targetFramework="net48" />
-  <package id="Microsoft.Owin" version="3.0.1" targetFramework="net48" />
+  <package id="Microsoft.Owin" version="4.0.0" targetFramework="net48" />
   <package id="Microsoft.Owin.Host.SystemWeb" version="3.0.1" targetFramework="net48" />
   <package id="Microsoft.Owin.Security" version="3.0.0" targetFramework="net48" />
   <package id="Microsoft.Owin.Security.Cookies" version="3.0.0" targetFramework="net48" />