Not sure why you'd have to download and recompile your old gems again using plain old Bundler. The strategy I've been using (and I think is becoming more popul

Not sure why you'd have to download and recompile your old gems again using plain old Bundler. The strategy I've been using (and I think is becoming more popular) is just to install all of your gems in one big pile, and use `bundle exec` to run your app in the limited environment provided by the Gemfile.lock. So if the update doesn't work out, you just twiddle a line in your Gemfile and `bundle exec` will magically load the older version (after `bundle install`, of course, which in this case will do zero network I/O).