Three major grocery store chains and the union representing Southern California grocery workers have reached a tentative deal for a new contract, both sides have announced.

The United Food and Commercial Workers and representatives of the Vons, Albertsons and Ralphs chains said Wednesday they would not discuss details of the new contract until it is ratified by union members.

The grocers and union last agreed to a new contract in 2011 after tensions that nearly led to a strike. This year’s talks were apparently less acrimonious, with no threats of strikes or lockouts.