diff --git a/Chapter.14/StockTicker.Server/packages.config b/Chapter.14/StockTicker.Server/packages.config
index 19699c11..809cbe35 100644
--- a/Chapter.14/StockTicker.Server/packages.config
+++ b/Chapter.14/StockTicker.Server/packages.config
@@ -10,7 +10,7 @@
   <package id="Microsoft.AspNet.WebApi.Core" version="5.2.3" targetFramework="net461" />
   <package id="Microsoft.AspNet.WebApi.Owin" version="5.2.3" targetFramework="net461" />
   <package id="Microsoft.AspNet.WebApi.OwinSelfHost" version="5.2.3" targetFramework="net461" />
-  <package id="Microsoft.Owin" version="3.0.1" targetFramework="net461" />
+  <package id="Microsoft.Owin" version="4.2.2" targetFramework="net461" />
   <package id="Microsoft.Owin.Cors" version="3.0.1" targetFramework="net461" />
   <package id="Microsoft.Owin.Host.HttpListener" version="3.0.1" targetFramework="net461" />
   <package id="Microsoft.Owin.Hosting" version="3.0.1" targetFramework="net461" />