Are tamper-resistant receptacles required in unfinished basements?

I'm replacing the standard non-GFCI receptacles in our unfinished basement with GFCI's. I bought the non-tamper-resistant versions. I've installed one so far, but then wondered if they are supposed to be tamper resistant. I did some Google searching but wasn't clear if code required them in UNfinished basements. They're all less than 5 feet above the floor. I don't want to install the rest until I get this clarified. I can exchange them if necessary. Thanks.