Late goals from substitutes Scott Vernon and Gregg Wylde gave Aberdeen their victory at Easter Road, putting them top of the pack clinging to hopes of catching Celtic.
Aberdeen manager Derek McInnes replaced Calvin Zola with Vernon just after the hour mark and the move paid off in the 79th minute when he drove the ball high past Hibernian goalkeeper Ben Williams from the edge of the box.
Wylde, who had come on for Peter Pawlett and set up Vernon for his goal, wrapped up the points with a breakaway effort in the second of four minutes of added time - his first goal for Aberdeen since signing for the club in the summer after leaving Bolton.
Kilmarnock striker Kris Boyd took his season's tally to six goals by netting twice in the 2-0 home win over Hearts.
The result leaves Hearts 15 points adrift at the foot of the table.
Dundee United returned to winning ways in style as they outclassed St Mirren 4-0 at Tannadice.
Nadir Ciftci's first-half double put Jackie McNamara's team in the driving seat before Ryan Gauld's and substitute Chris Erskine netted in the second half.
Meanwhile, Jon Daly's hat-trick helped Rangers extend their 100% start to the season to 10 games as they won 4-0 at East Fife in Scottish League One.