WPMU DEV Dashboard fails to update

petloversmonthly.com

Currently running version 4.0.2, and trying to update to the latest version (4.0.6 at the time of this ticket).

After i click "update now" i get a red error saying 'oops, we could not do this…" See attached image.

Granted, I could easily do the update via FTP, but I prefer doing it via the wp-admin interface, as I don't have to do permissions refreshes, or risk losing settings.