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We present a new analysis of the diffuse soft $\gamma$-ray emission towardsthe inner Galaxy as measured by the SPectrometer aboard the INTEGRAL satellite(SPI) with 16 years of data taking. The analysis implements a spatial templatefit of SPI data and an improved instrumental background model. We characterizethe contribution of Primordial Black Holes (PBH) as dark matter (DM) candidatesevaporating into $\mathcal{O}$(1) MeV photons by including, for the first time,the spatial distribution of their signal into the fitting procedure. No PBHsignal is detected, and we set the strongest limit on PBH DM for masses up to$4 \times 10^{17}$ g, significantly closing in into the so-called asteroid massrange.

Strong constraints on primordial black hole dark matter from 16 years of INTEGRAL/SPI observations