  The CLEO detector at the Cornell Electron Storage Ring (CESR) is completing a
major upgrade that significantly extends its physics reach in the study of
heavy quarks and leptons. The major elements of this detector upgrade are the
installation of a ``fast'' ring imaging Cherenkov detector, a new central drift
chamber and a new barrel-style silicon strip vertex detector. Trigger and data
acquisition systems are also upgraded. We summarize the status of these
detector subsystems as well as the parallel CESR upgrade.
