Rangers remain four points clear at the top of the table after beating Livingston 1-0 at Ibrox thanks to a goal from substitute Scott Arfield.
Celtic defeated Hearts 2-1 at Tynecastle with first-half goals from Reo Hatate - a stunning strike from distance - and Giorgos Giakoumakis. Liam Boyce reduced the deficit after the break and later hit the post with a penalty.
Dundee United hit back to beat Ross County 2-1 at Tannadice thanks to a Nicky Clark double after Regan Charles-Cook had opened the scoring.
Motherwell stay just above Hibernian in the top half after the teams played out a 0-0 draw at Fir Park. Well had Liam Donelly sent off after 73 minutes.
Bottom club St Johnstone remain two points adrift of Dundee at the foot of the table after the sides drew 0-0 at McDiarmid Park.
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