diff --git a/Source/Fiddle/packages.config b/Source/Fiddle/packages.config
index f443f49..c5fc4d2 100644
--- a/Source/Fiddle/packages.config
+++ b/Source/Fiddle/packages.config
@@ -10,7 +10,7 @@
   <package id="Microsoft.CodeAnalysis.CSharp.Scripting" version="1.1.1" targetFramework="net461" />
   <package id="Microsoft.CodeAnalysis.Scripting" version="1.1.1" targetFramework="net461" />
   <package id="Microsoft.CodeAnalysis.Scripting.Common" version="1.1.1" targetFramework="net461" />
-  <package id="Microsoft.Owin" version="3.0.1" targetFramework="net461" />
+  <package id="Microsoft.Owin" version="4.0.0" targetFramework="net461" />
   <package id="Microsoft.Owin.FileSystems" version="3.0.1" targetFramework="net461" />
   <package id="Microsoft.Owin.Host.HttpListener" version="2.0.2" targetFramework="net461" />
   <package id="Microsoft.Owin.Host.SystemWeb" version="3.0.1" targetFramework="net461" />