diff --git a/Chapter.14/StockTicker.Server.Common/packages.config b/Chapter.14/StockTicker.Server.Common/packages.config
index d7d97c77..1777cb80 100644
--- a/Chapter.14/StockTicker.Server.Common/packages.config
+++ b/Chapter.14/StockTicker.Server.Common/packages.config
@@ -4,7 +4,7 @@
   <package id="FSharp.Control.Reactive" version="3.5.0" targetFramework="net47" />
   <package id="FSharp.Core" version="4.3.4" targetFramework="net47" />
   <package id="Microsoft.AspNet.SignalR.Core" version="2.2.1" targetFramework="net47" />
-  <package id="Microsoft.Owin" version="2.1.0" targetFramework="net47" />
+  <package id="Microsoft.Owin" version="4.1.1" targetFramework="net47" />
   <package id="Microsoft.Owin.Security" version="2.1.0" targetFramework="net47" />
   <package id="Newtonsoft.Json" version="6.0.4" targetFramework="net47" />
   <package id="Owin" version="1.0" targetFramework="net47" />