diff --git a/Outlook-Add-in-Microsoft-Graph-ASPNETWeb/packages.config b/Outlook-Add-in-Microsoft-Graph-ASPNETWeb/packages.config
index 8f7862a..ec10cca 100644
--- a/Outlook-Add-in-Microsoft-Graph-ASPNETWeb/packages.config
+++ b/Outlook-Add-in-Microsoft-Graph-ASPNETWeb/packages.config
@@ -14,7 +14,7 @@
   <package id="Microsoft.Identity.Client" version="3.0.8" targetFramework="net452" />
   <package id="Microsoft.Net.Compilers" version="3.1.0" targetFramework="net452" developmentDependency="true" />
   <package id="Microsoft.Office.js" version="1.1.0.7" targetFramework="net452" />
-  <package id="Microsoft.Owin" version="2.1.0" targetFramework="net452" />
+  <package id="Microsoft.Owin" version="4.0.0" targetFramework="net452" />
   <package id="Microsoft.Owin.Host.SystemWeb" version="2.1.0" targetFramework="net452" />
   <package id="Microsoft.Owin.Security" version="2.1.0" targetFramework="net452" />
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net452" />