Hello Guix! The "core-updates" branch is ready for testing! According to 'guix weather', the substitute coverage is slightly better than on "master" for x86_64. You can get it by running: guix pull --branch=core-updates Please try upgrading your profiles and systems and file bugs for anything that does not work for you. GNOME users in particular are encouraged to try the new GNOME 3.34 and report any regressions. If you don't feel like jumping into the deep end, you can pull it to a temporary location instead of the default ~/.config/guix/current: guix pull -p /tmp/core-updates --branch=core-updates /tmp/core-updates/bin/guix package -u That way you don't have to 'guix pull --roll-back' to get at your previous Guix (from the "master" branch). Enjoy!