The travel operator says roadworks which are taking place on Gateside Street in the town are expected to disrupt buses in the area.
Due to the works, users of the firm’s 226 and 229 services are being urged to plan their journeys and allow additional travel time as buses might be caught in traffic on the street.
The roadworks will start on Monday, January 13 and are expected to last for around nine weeks.
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A spokesperson for First Bus, said: “We’re committed to providing an efficient and reliable service for customers.
“Like any other road users, our buses are impacted by roadworks and circumstances out of our control.
“We’ve issued a notice in advance to support customers as far as possible and allow them to plan journeys.
“Further information can be found via our website, social channels and through our customer services team.”