Default [Q] Update rooted 4.2 MDL?

This is my first time updating a rooted device. I switched to android this summer. I am currently rooted on stock 4.2 MDL. To update to 4.3 I can't use the OTA right? Do I need to flash a copy of it myself since I'm already rooted? Or do I unroot then update? Not sure how the whole process works.