diff --git a/c-sharp/file-upload/api/packages.config b/c-sharp/file-upload/api/packages.config
index 455c7c4..84a9603 100644
--- a/c-sharp/file-upload/api/packages.config
+++ b/c-sharp/file-upload/api/packages.config
@@ -15,7 +15,7 @@
   <package id="Microsoft.AspNet.WebApi.WebHost" version="5.2.7" targetFramework="net48" />
   <package id="Microsoft.AspNet.WebPages" version="3.2.7" targetFramework="net48" />
   <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="2.0.0" targetFramework="net48" />
-  <package id="Microsoft.Owin" version="4.1.0" targetFramework="net48" />
+  <package id="Microsoft.Owin" version="4.1.1" targetFramework="net48" />
   <package id="Microsoft.Owin.Host.SystemWeb" version="4.1.0" targetFramework="net48" />
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net48" />
   <package id="Modernizr" version="2.8.3" targetFramework="net48" />