最新になっていない Gem を洗い出す

• Bundler: The best way to manage a Ruby applications gems

console

$ bundle outdated
Updating git://github.com/byroot/rails3_acts_as_paranoid
Fetching gem metadata from https://rubygems.org/.......
Resolving dependencies...

Outdated gems included in the bundle:
  * acts_as_paranoid (0.4.2 > 0.4.1 4265d9f)
  * aws-sdk (1.29.0 > 1.11.1)
  * devise (3.2.2 > 3.2.0)
  * geokit (1.7.1 > 1.6.7)
  * geokit-rails (2.0.1 > 2.0.0)
  * honeybadger (1.9.4 > 1.9.3)
  * kaminari (0.15.0 > 0.14.1)
  * spring (1.0.0 > 0.9.2)