# RubyGems [](https://codeclimate.com/github/rubygems/rubygems/maintainability)
RubyGems is a package management framework for Ruby.
A package (also known as a library) contains a set of functionality that can be invoked by a Ruby program, such as reading and parsing an XML file.
We call these packages "gems" and RubyGems is a tool to install, create, manage and load these packages in your Ruby environment.
RubyGems is also a client for [RubyGems.org](https://rubygems.org), a public repository of Gems that allows you to publish a Gem
that can be shared and used by other developers. See our guide on publishing a Gem at [guides.rubygems.org](https://guides.rubygems.org/publishing/)
## Getting Started
Installing and managing a Gem is done through the `gem` command. To install a Gem such as [Nokogiri](https://github.com/sparklemotion/nokogiri) which lets
you read and parse XML in Ruby:
$ gem install nokogiri
RubyGems will download the Nokogiri Gem from RubyGems.org and install it into your Ruby environment.
Finally, inside your Ruby program, load the Nokogiri gem and start parsing your XML:
require 'nokogiri'
Nokogiri.XML('<h1>Hello World</h1>')
For more information about how to use RubyGems, see our RubyGems basics guide at [guides.rubygems.org](https://guides.rubygems.org/rubygems-basics/)
## Requirements
* RubyGems 2.6 supports Ruby 2.4 or lower.
* RubyGems 2.7 supports Ruby 2.5 or lower.
* RubyGems 3.0 supports Ruby 2.3 or later.
## Installation
RubyGems is already installed in your Ruby environment, you can check the version you have installed by running `gem --version` in your terminal emulator.
In some cases Ruby & RubyGems may be provided as OS packages. This is not a
recommended way to use Ruby & RubyGems. It's better to use a Ruby Version
Manager, such as [rbenv](https://github.com/rbenv/rbenv) or
[chruby](https://github.com/postmodern/chruby). If you still want to use the
version provided by your OS package manager, please also use your OS package
manager to upgrade rubygems, and disregard any other installation instructions
given below.
If you would like to manually install RubyGems:
* Download from https://rubygems.org/pages/download, unpack, and `cd` into RubyGems' src
* OR clone this repository and `cd` into the repository
Install RubyGems by running:
$ ruby setup.rb
For more details and other options, see:
$ ruby setup.rb --help
## Upgrading RubyGems
To upgrade to the latest RubyGems, run:
$ gem update --system
See [UPGRADING](UPGRADING.md) for more details and alternative instructions.
## Documentation
RubyGems uses [rdoc](https://github.com/rdoc/rdoc) for documentation. A compiled set of the docs
can be viewed online at [rubydoc](https://www.rubydoc.info/github/rubygems/rubygems).
RubyGems also provides a comprehensive set of guides which covers numerous topics such as
creating a new gem, security practices and other resources at https://guides.rubygems.org
## Getting Help
### Filing Tickets
Got a bug and you're not sure? You're sure you have a bug, but don't know
what to do next? In any case, let us know about it! The best place
for letting the RubyGems team know about bugs or problems you're having is
[on the RubyGems issues page at GitHub](http://github.com/rubygems/rubygems/issues).
### Bundler Compatibility
See http://bundler.io/compatibility for known issues.
### Supporting
<a href="https://rubytogether.org/"><img src="https://rubytogether.org/images/rubies.svg" width=200></a><br/>
<a href="https://rubytogether.org/">Ruby Together</a> pays some RubyGems maintainers for their ongoing work. As a grassroots initiative committed to supporting the critical Ruby infrastructure you rely on, Ruby Together is funded entirely by the Ruby community. Contribute today <a href="https://rubytogether.org/developers">as an individual</a> or even better, <a href="https://rubytogether.org/companies">as a company</a>, and ensure that RubyGems, Bundler, and other shared tooling is around for years to come.
### Contributing
If you'd like to contribute to RubyGems, that's awesome, and we <3 you. Check out our [guide to contributing](CONTRIBUTING.md) for more information.
While some RubyGems contributors are compensated by Ruby Together, the project maintainers make decisions independent of Ruby Together. As a project, we welcome contributions regardless of the author’s affiliation with Ruby Together.
### Code of Conduct
Everyone interacting in the RubyGems project’s codebases, issue trackers, chat rooms, and mailing lists is expected to follow the [contributor code of conduct](https://github.com/rubygems/rubygems/blob/master/CODE_OF_CONDUCT.md).
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