  During the upcoming High Luminosity phase of the Large Hadron Collider
(HL-LHC), the integrated luminosity of the accelerator will increase to 3000
fb$^{-1}$. The expected experimental conditions in that period in terms of
background rates, event pileup, and the probable aging of the current detectors
present a challenge for all the existing experiments at the LHC, including the
Compact Muon Solenoid (CMS) experiment. To ensure a highly performing muon
system for this period, several upgrades of the Resistive Plate Chamber (RPC)
system of the CMS are currently being implemented. These include the
replacement of the readout system for the present system, and the installation
of two new RPC stations with improved chamber and front-end electronics
designs. The current overall status of this CMS RPC upgrade project is
presented.
