The U.S. Food and Drug Administration (FDA) announced Wednesday that it has authorized updated coronavirus booster shots targeting the highly-contagious omicron variant.

"Today, the U.S. Food and Drug Administration amended the emergency use authorizations (EUAs) of the Moderna COVID-19 Vaccine and the Pfizer-BioNTech COVID-19 Vaccine to authorize bivalent formulations of the vaccines for use as a single booster dose at least two months following primary or booster vaccination," it said in a statement.

The Food and Drug Administration on Wednesday authorized new Covid booster shots from Moderna and Pfizer that more closely match the strains of the coronavirus that are currently circulating in the U.S.

Pfizer’s booster, made with partner BioNTech, is being authorized for people as young as 12 years old. The Moderna booster is being authorized for people ages 18 and up.

COVID-19 vaccines designed to target the omicron variant have just been authorized by the Food and Drug Administration. Both Pfizer / BioNTech and Moderna got the FDA’s sign-off for their booster doses of the reformulated shot. This is the first update to COVID-19 vaccines to be authorized in the United States.

The Pfizer / BioNTech booster is available to people 12 and older, and the Moderna shot will be available to people 18 and older. They’ll only be boosters — they can’t be used by people who haven’t already had their first doses.