On-loan Norwich City striker Carlton Morris got the only goal with 19 minutes left as Hamilton Accies beat Kilmarnock 1-0 at Rugby Park on Saturday.
The result lifts Martin Canning's men up to eighth place in the Ladbrokes Premiership table while Killie remain in the relegation play-off spot.
Dundee are into the top six after a 2-2 draw with Motherwell at Dens Park, where Kane Hemmings equalised with an 88th-minute penalty.
Chris Cadden's early opener was quickly cancelled out by Paul McGowan and Hemmings struck after Stephen Pearson had restored Well's advantage.
The games between Inverness CT and Hearts and Partick Thistle and Dundee United were both postponed.