Rails on my blog’s host server was upgraded to the latest RC early this morning. My Typo 2.5.5 got very upset with this, and my blog has been down all day.
Upgrading my Typo was fairly easy. Sync up the code on my dev machine, use WinSCP to sync the directories up (fix up the .htaccess file, because I failed to merge the conflicts before I started!) I had to restore my /public/files directory as the WinSCP sync deleted it.
When you run the Typo Admin code after this, it detects that a DB migration is needed and does the work for you. Sweet!