How to update from 5.0 to 5.1 and gain root again?

So currently I have a SGP611 with Android 5.0.2. It's rooted via KingRoot and switched to SuperSU with the help of XZDualRecovery. So, that means I have 5.0.2 with SuperSU and XZDualRecovery.
The bootloader is intact and locked.
How do I upgrade to 5.1.1 and get root again since KingRoot won't work with 5.1.1?
And it would be nice if during the update process no data wiping is necessary.