[Rails] Gem Rails Version Showing Wrong?

Hello, and first of all, Im starting with ruby and Ive installed into my server, sorry for my newbie question here guys.

After install rails when I type rails -v it shows Rails 2.3.18 but after I type gem dependency rails it shows Gem rails-4.2.0 and other dependencies.

Please, what are the real version?

Thanks very much.

Like that:

#rails -v

Rails 2.3.18

# gem dependency rails

Gem rails-4.2.0

...show the dependencies

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