At this moment dems need 60 senate votes to pass this, but they are relentless. Do they need 60 votes to make Puerto Rico a state?
The senate makes and changes rules on whim, so the answer to that isn't known.
Technically, only a majority is needed. The idea that the 60 vote senate is some long standing "cooling saucer, avoid partisan action" procedure is a myth. The senate is abusing a parliamentary device, cloture, to maintain a minority veto body, but only on selected points. The senators like this because it gives each individual senator more opportunities to assert the power inherent in a minority veto body.
Just as it changed the abuse of cloture toward judges, the senate could just say "vote on statehood is unique" and use that to justify a conclusion that Rule 22 (the one that embodies cloture) be applied in such a way that minority veto does not apply.