It's in Debian (possibly upstream only), but you can download the latest version from their website and install it manually.
The MX 15/ MEPIS repositories
: Backports galore! If we don't have something, just ask and we'll try--we like challenges. New packages: plank 0.11.1, Pale Moon 26.2.1, Liquorix kernel 4.5-4, mpv 0.17, Kodi 16.1, QBittorrent 3.3.4, HPLIP 3.16.3