The CDF and D0 collaborations have updated their measurements of
the mass of the top quark using proton-antiproton collisions at s**(1/2) =
1.96 TeV produced at the Tevatron.  The uncertainties in each of the
top-antitop decay channels have been reduced.  The new Tevatron average for
the mass of the top quark based on about 1 fb-1 of data per experiment is
170.9 +/- 1.8 GeV/c2.