  We update our perturbative determination of MSbar bottom quark mass mb(mb),
by including the recently obtained four-loop coefficient in the relation
between the pole and MSbar mass. First the renormalon subtracted (RS or RS')
mass is determined from the known mass of the Upsilon(1S) meson, where we use
the renormalon residue Nm obtained from the asymptotic behavior of the
coefficient of the 3-loop static singlet potential. MSbar mass is then obtained
using the 4-loop renormalon-free relation between the RS (RS') and MSbar mass.
We argue that the effects of the charm quark mass are accounted for by
effectively using Nf=3 in the mass relations. The extracted value is mb(mb) =
4222(40) MeV, where the uncertainty is dominated by the renormalization scale
dependence.
