RubyGems, the Ruby package manager, should be installed on your machine if you previously have installed Ruby. Verify this by running:

$ which gem

Update RubyGems

To update to its latest version with:

$ gem update --system

Install gems

To install a gem (Ruby package), run:

$ gem install <gemname>

To install without generating the documentation for each gem (faster):

$ gem install <gemname> --no-document

List installed gems

$ gem list

To check if any installed gems are outdated:

$ gem outdated

Update installed gems

To update all gems or a particular gem:

$ gem update [<gemname>]

Remove old gem versions

RubyGems keeps old versions of gems, so feel free to do some cleaning after updating:

$ gem cleanup

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