Efforts were made to update the warheads: the 155 mm W74 and 203 mm W75 were developed from about 1970, and they were intended to have a yield of 100 tons or more. These versions were canceled in 1973. A further development program began in the 1980s: the W82, for the XM-785 (a 155 mm shell), was intended to yield up to two kilotons with an enhanced radiation capability. Its development was halted in 1983. A W82-1 fission-only type was designed but was canceled in 1990.