To update all the gems on your system with all the current versions, use the update command.


# The --system flag updates the RubyGems system software (some output truncated).

$ gem update --system

1.	RubyGems is a package utility for Ruby
2.	getting help on how to issue RubyGems commands:
3.	get help on what commands are available (some output truncated).
4.	help on examples (some output truncated).
5.	gem help env
6.	Show everything on the RubyGems environment with this command:
7.	show the RubyGems installation directory:
8.	Let's check to see if Ruby on Rails is present with the list command.
9.	You can check what dependencies a gem has with the dependency command:
10.	To select dependencies as you install a package, skip the --include-dependencies option
11.	To uninstall a package with the uninstall command:

To update all the gems on your system with all the current versions, use the update command. : RubyGems « Language Basics « Ruby