Tenants saying they will move out a week late but I already have new tenants moving in by then

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I have some tenants that are supposed to be out by August 1st. There are new tenants moving in on August 4th. I recently got a message from the current ones saying "we might not be able to be out until a week later". I sternly told them their lease was up then and there are already new tenants moving in on the 4th.

I don't think they will stay later but what should I do if they just take their time and move out late? There is obviously eviction but the costs don't seem to be worth it since they would already be moving out. Is there any other way I can force them out or something?