Dumbarton put on a brave performance but fell out of the Scottish Cup against Rangers this evening.
The visitors dominated the early proceedings with Harry Broun impressing in goal, though Sons had their chances as Michael Ruth was denied by Robby McCrorie at close range.
Goals from John Lundstram and Cyriel Dessers had Gers comfortable at the break and James Tavernier made the visitors spot in the next round safe after the interval.
Matty Shiels pulled one back for Dumbarton in the closing stages though Scott Wright restored the three goal margin moments later.
Sons travel to Elgin next weekend.