Updating in Production - Sageth/phparcade GitHub Wiki
There's not really a straight upgrade path at this point. There will be one in the future.
Updating the code should just be running this from the command line:
$ git pull
Upgrading the database isn't that easy, though I'm looking at some solutions to handle this. My suggestion would be to export all of your data from all tables and then run the /installation/create_database.sql again. Once complete, import your data. It should work, though you may need to clean things up a bit.