diff --git a/odatav4-adaptor-service/Restful_Crud/packages.config b/odatav4-adaptor-service/Restful_Crud/packages.config
index ca54313..432b8a3 100644
--- a/odatav4-adaptor-service/Restful_Crud/packages.config
+++ b/odatav4-adaptor-service/Restful_Crud/packages.config
@@ -8,7 +8,7 @@
   <package id="Microsoft.AspNet.WebApi.WebHost" version="5.2.3" targetFramework="net45" />
   <package id="Microsoft.Data.Edm" version="5.6.0" targetFramework="net45" />
   <package id="Microsoft.Data.OData" version="5.8.4" targetFramework="net45" />
-  <package id="Microsoft.Owin" version="3.0.1" targetFramework="net45" />
+  <package id="Microsoft.Owin" version="4.0.0" targetFramework="net45" />
   <package id="Newtonsoft.Json" version="6.0.4" targetFramework="net45" />
   <package id="Owin" version="1.0" targetFramework="net45" />
   <package id="System.Spatial" version="5.6.0" targetFramework="net45" />