aquilarubra [1] filed a orphan request for muse [2]: The author is not reachable any longer (his email does not exist on Gmail server). It seems that there is no response to update the package in a long time.
[1] https://aur.archlinux.org/account/aquilarubra/ [2] https://aur.archlinux.org/pkgbase/muse/
