It seems there isn't much interest in NetHack here, but the devteam just released 5.0.0. The last version was 3.6 something, and this is basically just 3.7 packaged as a new version. They skipped v4 because of an already-existing fork of the game from the dormant-development days.
https://nethack.org/v500/release.html
https://nethack.org/v500/release.html
