Rangers closed the gap on Heart of Midlothian to two points with a 4-2 win over Derek McInnes' side at Ibrox on Sunday.
Hearts were twice ahead in the first half through Marc Leonard and Claudio Braga but a Youssef Chermiti hat-trick and a Michael Steinwender own goal gave Danny Rohl's men a crucial victory in the title race.
Celtic staged a dramatic comeback to beat Kilmarnock 3-2 at Rugby Park and move to within two points of the summit.
Goals from Tyreece John-Jules and Joe Hugill had Killie in command at the break but Sebastian Tounekti and Benjamin Nygren levelled things up and Julian Araujo grabbed the winner in the seventh minute of stoppage time.
Fourth-placed Motherwell continued their good run, beating Aberdeen 2-0 at Fir Park with a goal from Elijah Just and a Tom McIntyre own goal.