The Centers for Disease Control and Prevention recommend that people ages five years and older receive one updated (bivalent) booster if it has been at least 2 months since their last COVID-19 vaccine dose, whether that was:
Their final primary series dose, or
An original (monovalent) booster
People who have gotten more than one original (monovalent) booster are also recommended to get an updated (bivalent) booster.
To find an updated bivalent booster:
Search https://www.vaccines.gov/
Text your zip code to 438829
Call 1-800-232-0233