Just tried to upgrade Anchor, but it completely failed. It's apparently relying on some PHP utility called Composer, which is not installed on this server. Fortunately I backed everything up, so it was a short process to roll back. (Using CI in my day job has made me very conscientious on ensuring that I can roll back any changes.)
To be fair, the latest release is not ready for release, but hey, we all like to live on the bleeding edge, right? The only problem is that sometimes your ass gets sliced up. Ah well. Try again later.