upgrade rails mapping app

Pretty simple project - I have an existing (fairly small) web application written in Rails hosted on heroku. It was working fine until the database service switched it's configuration system. The tasks would be as follows: 1. Update the database connection to the new configuration and get it working (service is [login to view URL]) 2. Update the projects rails config to get the latest bug patch version. 3. Possibly look at updating to the latest rails version, but is not needed if too many changes.