The Japanese staff of Uber Technologies Inc.’s food delivery service Uber Eats have formed a labor union to negotiate contract terms and seek improved working conditions.

Uber and ride-hailing rival Lyft Inc. have faced criticism for not providing their contract workers, known as “platformers,” with accident insurance and other benefits enjoyed by regular workers.

“We would like to improve the working environment for Uber Eats delivery staff through negotiations,” Tomio Maeba, chairman of the union, said at a Thursday news conference in Tokyo attended by a dozen contract workers.