As mentioned in my previous post I recently built a small internal micro app with merb. As part of the process of deploying that app I needed/wanted to update to the latest version of Ruby Enterprise Edition (REE) and Passenger on my slice. One of the issues I ran into while trying to update the REE version is that all my old gems where not installed in my fresh new version of REE. There may be a better way to accomplish this task, but the approach I ended up using was to modify this capistrano file (http://github.com/jtimberman/ree-capfile/tree/master) to install the gems in the old version of REE in the new version.