Heart of Midlothian booked their place in Sunday's draw for the last 16 of the Premier Sports Cup with a 4-0 home win over Dumbarton on Wednesday night.
Derek McInnes' men made it four wins out of four with goals from Lawrence Shankland, Michael Steinwender, Alexandros Kyziridis and Claudio Braga.
Meanwhile, Airdrieonians moved to the top of Group C, above Alloa on goal difference, thanks to a 2-1 win over Montrose in a game played at Gayfield due to pitch works at Links Park.