LOUISVILLE, Ky. — If you're ready to rock out at this year's Louder Than Life festival, you may want to get your COVID-19 vaccine if you haven't already.

The festival announced Wednesday that all artists, staff, crew and attendees will have to show proof of either a full COVID-19 vaccination or negative COVID-19 test.

Set to run September 23-26, Louder Than Life is one of the largest rock festivals in the U.S. This year's lineup features acts like Nine Inch Nails, Korn and Metallica. It'll be the first iteration in almost two years, since last year's festival was cancelled.

Fans will have to present proof of vaccination as soon as they enter the festival grounds, organizers said. The festival will accept the original card, printed copies and digital copies.

Those who aren't vaccinated upon arrival will have to bring a negative test taken within 72 hours of entry. The results can be printed or digital, and must include name, testing date, negative results and a photo ID.

"We thank you for your patronage, support and compliancy during these unprecedented times," the festival's website reads. "We are all in this together."