bundle outdated

List installed gems with newer versions available
$ bundle outdated [GEM] [--local] [--pre] [--source] [--strict]

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

--strict: Display outdated gems that match the dependency requirements.

Outdated lists the names and versions of gems that have a newer version available in the given source. Calling outdated with [GEM [GEM]] will only check for newer versions of the given gems.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.
Fork me on GitHub
Docs: v0.9 v1.0 v1.1 v1.2 v1.3 v1.5 v1.6