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Milky Way dwarf spheroidal galaxies (dSphs) are among the best candidates tosearch for signals of dark matter annihilation with Imaging AtmosphericCherenkov Telescopes, given their high mass-to-light ratios and the fact thatthey are free of astrophysical gamma-ray emitting sources. Since 2011, MAGIChas performed a multi-year observation program in search for Weakly InteractingMassive Particles (WIMPs) in dSphs. Results on the observations of Segue 1 andUrsa Major II dSphs have already been published and include some of the moststringent upper limits (ULs) on the velocity-averaged cross-section $\langle\sigma_{\mathrm{ann}} v \rangle$ of WIMP annihilation from observations ofdSphs. In this work, we report on the analyses of 52.1 h of data of Draco dSphand 49.5 h of Coma Berenices dSph observed with the MAGIC telescopes in 2018and in 2019 respectively. No hint of a signal has been detected from either ofthese targets and new constraints on the $\langle \sigma_{\mathrm{ann}} v\rangle$ of WIMP candidates have been derived. In order to improve thesensitivity of the search and reduce the effect of the systematic uncertaintiesdue to the $J$-factor estimates, we have combined the data of all dSphsobserved with the MAGIC telescopes. Using 354.3 h of dSphs good quality data,95 % CL ULs on $\langle \sigma_{\mathrm{ann}} v \rangle$ have been obtained for9 annihilation channels. For most of the channels, these results reach valuesof the order of $10^{-24} $cm$^3$/s at ${\sim}1$ TeV and are the most stringentlimits obtained with the MAGIC telescopes so far.

Combined searches for dark matter in dwarf spheroidal galaxies observed with the MAGIC telescopes, including new data from Coma Berenices and Draco