diff --git a/V1-Samples/Chapter-2/WebCalculatorService/packages.config b/V1-Samples/Chapter-2/WebCalculatorService/packages.config
index 61a37d8..7c73506 100644
--- a/V1-Samples/Chapter-2/WebCalculatorService/packages.config
+++ b/V1-Samples/Chapter-2/WebCalculatorService/packages.config
@@ -4,7 +4,7 @@
   <package id="Microsoft.AspNet.WebApi.Core" version="5.2.3" targetFramework="net452" />
   <package id="Microsoft.AspNet.WebApi.Owin" version="5.2.3" targetFramework="net452" />
   <package id="Microsoft.AspNet.WebApi.OwinSelfHost" version="5.2.3" targetFramework="net452" />
-  <package id="Microsoft.Owin" version="2.0.2" targetFramework="net452" />
+  <package id="Microsoft.Owin" version="4.2.2" targetFramework="net452" />
   <package id="Microsoft.Owin.Host.HttpListener" version="2.0.2" targetFramework="net452" />
   <package id="Microsoft.Owin.Hosting" version="2.0.2" targetFramework="net452" />
   <package id="Microsoft.ServiceFabric" version="5.6.210" targetFramework="net452" />