It says there is an update available but there is no update

Hi Tenno, you're sure that you're on the latest iOS and on the App Store when you search Warframe, it does not say "UPDATE" beside the game's title? 

If you are up to date, it will just say "Open"

If you are an update behind, it will say "Update" where my screenshot currently says "Open"

Hi Tenno! Are you still experiencing this? If so I may request your game logs, but not until you confirm it still says "update required" and won't let you in 

Sorry to hear it! Could you send us logs by tapping the very top of the screen on the launcher / install page? It doesn't matter if it says Update Available, it should still let you download your logs! Here are more instructions: