Try running 'bundle install' (or 'bundle' for short) from the command
line and then repushing to Heroku. If that doesn't work, try 'bundle
update'.
Make sure you run bundle install anytime after changing your Gemfile.
============
About Gemfile.lock:
If you have
gem 'rails'
in your Gemfile, when you run 'bundle install' for the first time,
Bundler will create your Gemfile.lock file to specify the version of the
gems that you're using (along with the gems that your gems depend on).
rails (3.0.3)
Typically, when you add or remove a gem, 'bundle install' will update
your Gemfile.lock file without a problem. However, when you get to
working with different gem versions then you may need 'bundle update'.
Be careful with this though, 'bundle update' without specifying a gem
will update ALL of your gems. So if a gem has a major version out that
your weren't aware of, your application may break.
Please read http://gembundler.com/man/bundle-update.1.html
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