Any way to tighten hat band?

[Rainy113]

I've read a few remarks on the line of "you can always tighten stitches but you can't loosen them." So I'm wondering - how do you tighten them? I have a beanie hat that did the band in 2x2 rib, then stockinette for the rest. I know I should have used smaller needles for the band but forgot. It's loose and wants to curl. Is there any way after the fact to tighten it? No big deal - it was really just practice. But is there a way?