When you say upgrade to "Next", are you looking for a specific feature that's not available right now? Can you please also check if you're running the latest version of the iOS app?
Thankyou for the quick response. The IOS is 7.1 the Todoist app is 8.1.1
(11767). I am not looking for a specific feature other than the new
interface and the ability to list completed tasks which was asked in the
Please note that the new interface for Todoist Next is referring to the web interface. The version of the app that you have right now is the most current version of iOS app.