How to Update Ruby on Rails on Linux

Check Installed Ruby Gems Package Manager Version

gem -v

Update RubyGems

gem update --system

List outdated gems

gem outdated

Update stale gems

gem update

Update Rails Project Basis

Rails updates on a project basis should specify the version in the GemFile:

source 'https://rubygems.org' gem 'rails', '4.1.9'

bundle update rails

Rails Update global

gem install rails --no-ri --no-rdoc

Check rails version

rails -v

Source: http://railsapps.github.io/ stackoverflow