Аннотация:A rapid growth of the 6.67 GHz methanol maser in G107.298+5.639 was observed during the night September 2/3 by Irbene 16 m radio telescope. A day before the flux densities of two components at VLSR= -8.6 km/s and VLSR= -7.38 km/s were around minimal detection level 0.8 Jy. During 17 hours both components reached 5 Jy peak flux density.