  We revisit the limit on very light axion-like particles (ALPs) from the
absence of gamma rays coincidental with the neutrino burst from SN1987A. We use
updated supernova simulations, modern models for the magnetic field inside the
Galaxy, and a Primakoff cross section which takes into account
proton-degeneracy and mass-reduction effects. We finally give an updated
exclusion plot for the electromagnetic coupling of sub-eV ALPs, comparing our
new bound with other limits as well as with future ALP searches.
