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We point out that recently discovered 3.5 keV line in X-ray spectra fromvarious galaxy clusters and the Andromeda galaxy can be naturally explained byphysics of a sector responsible for spontaneous supersymmetry breaking inmodels with R-parity. In this scenario the source of this line could be decayof sgoldstino - scalar superpartner of massive gravitino. At the same time thedominant dark matter component is stable gravitino whose mass is predicted tobe about 0.25 GeV.

SUSY in the sky or a keV signature of sub-GeV gravitino dark matter