Squeaky a/c pulley

I have a 2002 Ram 1500 5.9 Liter 4x4. Over the past few weeks, I started noticing a squeaking from the belt. Upon further inspection, I noticed the squeak coming from the A/C pulley. I sprayed a little lubricant on it while running to see if that would take care of it but it starts squeaking again after a few minutes. This squeaking does not get worse or better whether I have the A/C on or not. Anyone ever experienced this?