What do you say to an interviewer that asks why you are leaving your current position?

I've got an interview with a company that is in the same line of work i do currently. I assume they will ask why I'm looking elsewhere and I can't really say "because i hate the people i work with and management sucks". What is a professional answer? It's for a accessory fitment position at a car dealership. So it's not 3 piece suite tier but i still want to come across professional and not give off the aura of 'my current job sucks'

Sorry if this is the wrong sub. I read the rules and didn't find it to say no.

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