In 2021, eligible State, Educator, Judicial, and Legislative retirement plan retirees received a 3% COLA on their benefit up to $22,947.11 (which is the 2020 base), or a maximum increase of $57.37/month. The amount of the COLA for 2021 was determined during the summer of 2021 and appeared in the 2021 September pension benefit.
https://www.mainepers.org/retirement/colas/
Regarding COLA with respect to Social Security wages: