MGM Resorts’ Las Vegas casinos are bracing for labor strife after the company failed to agree on a new contract with its unionized employees.

Labor agreements between 34 Las Vegas casinos and the 50k workers of the Culinary Workers Union Local 226 and Bartenders Union Local 165 expired at midnight Thursday. The union members had previously voted to hit the picket lines if new deals weren’t reached by Friday.

Early Friday morning, the Culinary Union announced that it had reached a tentative agreement with Caesars Entertainment, which operates nine of the strike-vulnerable casinos. Specifics of the new five-year agreement have yet to leak but the unions had been seeking annual wage hikes of 4% and greater workplace safety protections.

MGM, which operates 10 of the affected casinos, claims to be continuing to negotiate with the unions, but offered no timeline on when it expected any breakthroughs.