Best-fit transit solutions of the four CHEOPS visits of AU Mic b (upper panels) and AU Mic c (lower panels) analyzed in this Letter, after omitting the flares during the transits. The phased points of the individual light curves are shown in light blue, and the binned light curve points of the individual transits are shown in dark blue. Lower panel: residuals observed at each individual visit. We highlight the increased variability of the light curve shape before the mid-transit of AU Mic b.