Do Warrant officers need a degree to get promoted?

I've heard that these days for NCO'S to make E-8 they pretty much need to have a graduate degree, and O's need a degree of course, but do Warrant officers need any kind of degree to have a realistic chance of promotion? They don't seem get the gaps in their career to get a degree like regular officers do. I don't know any Warrants to ask how their promotions work.