It is foreseen to install a dual channel receiver (3 and 1.3 mm bands) on Antenna 4 in June, and a second one (presumably on Antenna 2) in September. Work is in progress to upgrade all receivers to dual-channel systems by January 1995. The new receivers will have SSB tuning with 10 to 20 dB rejection, with the drawback that truly DSB tuning may not be possible at all frequencies. CO(J=1-0) will be reachable in LSB, thus improving the sensitivity by a factor 2 as compared to the current system. The upgrade plan also includes a complete replacement of the LO2 system.