Uber will hike minimum fares and slug passengers with an extra booking fee from next month so it can cover "operational costs".

The "ride sharing" service, which operates as an alternative to taxis, said drivers had been calling for minimum fare rates to be raised.

From June 9, passengers will also pay a 55¢ booking fee on every trip to "assist with the operational costs associated with providing a ridesharing service", an Uber spokesman said.