If your Wagn was installed from a gem, and you want to upgrade to version 1.12.13 (last service version for 1.12 before the minor 1.13.0 release) follow these steps:
1. create backups
Always back up your database and uploaded files.
2. update your gems
From your wagn root directory run:bundle update
3. update your database
Run the following:rake wagn:migrate
As with all rake commands, you can try prefacing with "bundle exec" if you encounter gem problems.
4. restart your server.