We have so far developed three optical mutlband imagers, named MuSCAT, MuSCAT2, and MuSCAT3, for 2m class telescopes located at different longitudes in the northern hemisphere (Japan, Spain, and Hawaii, respectively), aiming at characterizing transiting exoplanets. MuSCAT4 is the fourth version of this series to be installed on the 2m telescope operated by Las Cumbres Observatory and located at Siding Spring Observatory. In our presentation, we will show the characteristics of the instrument, the time schedule of the development, and the science goals that we will pursue with it.