diff --git a/src/code-listings/lesson-38/FSharpWeb/packages.config b/src/code-listings/lesson-38/FSharpWeb/packages.config
index 104c5a4..bb90102 100644
--- a/src/code-listings/lesson-38/FSharpWeb/packages.config
+++ b/src/code-listings/lesson-38/FSharpWeb/packages.config
@@ -5,7 +5,7 @@
   <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="4.1.1" 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" />