How long with android 5.1?

Hello, I just tested the App out on Samsung Xcover 3. It works marvellous. But the device is only working up to Android Lollipo#p (5.1).Is there any risk, that after the next update of it will work no longer with the old bone?

It is better to get devices with new Android, they will always have more future.

It’s not really up to us, but Google’s constant Android changes (forced to apps).
Min Android version was increased because previous versions have problems.