Currently the CDC recommends one updated bivalent omicron booster dose if it has been two months since your last dose (of either a previous booster or your primary series). If you received a booster dose after the date the bivalent booster was rolled out in the U.S. for your age group, you received the bivalent booster. That date was September 2, 2022, for people 12 years and older. More information on staying up to date with COVID-19 vaccines is available from the CDC.