How to get RubyGems and Bundler and keep them up to date. RubyGems and Bundler ship with Ruby, so installing Ruby gives you both tools. To check that they are available: gem --version bundle --version If you do not have Ruby yet, see the [official installation guide](https://www.ruby-lang.org/en/documentation/installation/) for the options available on your platform. Updating RubyGems ----------------- Ruby comes with the RubyGems version that was current when that Ruby was released. To upgrade to the latest version: gem update --system To upgrade to a specific version instead, pass the version number: gem update --system Both forms download the `rubygems-update` gem and run its `setup.rb`, so they need network access. On a machine without it, fetch the release archive from the [download page](https://rubygems.org/pages/download) elsewhere, copy it over, then unpack it and install from the unpacked directory: ruby setup.rb Run `ruby setup.rb --help` for the available options. Updating Bundler ---------------- To install the latest Bundler: gem install bundler Bundler is a [default gem](/default-gems-and-bundled-gems), so every Ruby installation always contains a version of it that cannot be uninstalled. Installing a newer version does not replace the default one. Both stay available. Which Bundler version runs -------------------------- A project's `Gemfile.lock` records the Bundler version that created it under `BUNDLED WITH`. When you run `bundle` commands in that project, Bundler automatically switches to the recorded version if it is installed, even when a newer version is present. To update the recorded version to the latest installed Bundler, run `bundle update --bundler`. See [Bundler compatibility](/bundler-compatibility) for the Ruby and RubyGems versions each Bundler release supports.