@JeremyECrawford a rangers pet can level up. But can a caster's familiar?
— BarryV.A. (@BarryVonAwesome) June 12, 2017
The find familiar spell doesn't cause your familiar to get more powerful over time. If the spell did, it would say so. #DnD https://t.co/6tNSVESDdD
— Jeremy Crawford (@JeremyECrawford) June 12, 2017