diff --git a/src/code-listings/lesson-39/Web/packages.config b/src/code-listings/lesson-39/Web/packages.config
index ef62fb8..3f9414e 100644
--- a/src/code-listings/lesson-39/Web/packages.config
+++ b/src/code-listings/lesson-39/Web/packages.config
@@ -6,7 +6,7 @@
   <package id="Microsoft.AspNet.WebApi.Core" version="5.2.2" targetFramework="net45" />
   <package id="Microsoft.AspNet.WebApi.Owin" version="5.2.2" targetFramework="net45" />
   <package id="Microsoft.AspNet.WebApi.WebHost" version="4.0.30506.0" targetFramework="net45" />
-  <package id="Microsoft.Owin" version="3.0.0" targetFramework="net45" />
+  <package id="Microsoft.Owin" version="4.0.0" targetFramework="net45" />
   <package id="Microsoft.Owin.Host.SystemWeb" version="3.0.0" targetFramework="net45" />
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net45" />
   <package id="MSBuild.Extension.Pack" version="1.3.0" targetFramework="net45" />