diff --git a/HydroServerTools/packages.config b/HydroServerTools/packages.config
index a9f86f7..869ba3f 100644
--- a/HydroServerTools/packages.config
+++ b/HydroServerTools/packages.config
@@ -34,7 +34,7 @@
   <package id="Microsoft.Data.OData" version="5.6.2" targetFramework="net45" />
   <package id="Microsoft.Data.Services.Client" version="5.6.2" targetFramework="net45" />
   <package id="Microsoft.jQuery.Unobtrusive.Validation" version="3.0.0" targetFramework="net45" />
-  <package id="Microsoft.Owin" version="2.1.0" targetFramework="net45" />
+  <package id="Microsoft.Owin" version="4.1.1" targetFramework="net45" />
   <package id="Microsoft.Owin.Host.SystemWeb" version="2.1.0" targetFramework="net45" />
   <package id="Microsoft.Owin.Security" version="2.1.0" targetFramework="net45" />
   <package id="Microsoft.Owin.Security.Cookies" version="2.1.0" targetFramework="net45" />