I'm still on iOS 6.1.4 with my iPhone and I don't want to upgrade, cause I don't like iOS 7. But since a few days my YouTube App always shows this thing here

"Update available. Do you want to update now?" Does anyone know, how to delete that message? I don't want this pop up to show up anymore. I tried to change and delete the iTunes metadata, but that didn't work.

I really need your help
Greetings from Germany