Run bundle outdated

To help decide if you want to take action and update a particular gem, view the gem's changelog.

For example, if there is an updated version of Devise available, Google devise changelog to determine what has been changed in the updated version.

Outdated lists the names and versions of gems that have a newer version available in the given source. Calling outdated with [GEM [GEM]] will only check for newer versions of the given gems. By default, available prerelease gems will be ignored.

Options:
--local: Do not attempt to fetch gems remotely and use the gem cache instead

--pre: Check for newer pre-release gems

--source: Check against a specific source

http://bundler.io/v1.1/bundle_outdated.html