Report issues and suggest features and improvements on the GitHub issue tracker. Don't ask questions on the issue tracker - use the support channels instead.

If you want to file a bug, please provide all the necessary info listed in our issue reporting template (it's loaded automatically when you create a new GitHub issue).


Patches in any form are always welcome! GitHub pull requests are even better! :-)

Before submitting a patch or a pull request make sure all tests are passing and that your patch is in line with the contribution guidelines. Also see the Development section.


Good documentation is just as important as good code. Check out the Documentation section of this guide and consider adding or improving Cop descriptions.

Working on the Manual

The manual is generated from the markdown files in the doc folder of RuboCop's GitHub repo and is published to Read the Docs. The MkDocs tool is used to convert the markdown sources to HTML.

To make changes to the manual you simply have to change the files under manual. The manual will be regenerated automatically when changes to those files are merged in master (or the latest stable branch).

You can install MkDocs locally and use the command mkdocs serve to see the result of changes you make to the manual locally:

$ cd path/to/rubocop/repo
$ mkdocs serve

If you want to make changes to the manual's page structure you'll have to edit mkdocs.yml.


While RuboCop is free software and will always be, the project would benefit immensely from some funding. Raising a monthly budget of a couple of thousand dollars would make it possible to pay people to work on certain complex features, fund other development related stuff (e.g. hardware, conference trips) and so on. Raising a monthly budget of over $5000 would open the possibility of someone working full-time on the project which would speed up the pace of development significantly.

We welcome both individual and corporate sponsors! We also offer a wide array of funding channels to account for your preferences (although currently Open Collective is our preferred funding platform).

If you're working in a company that's making significant use of RuboCop we'd appreciate it if you suggest to your company to become a RuboCop sponsor.

You can support the development of RuboCop via Salt, Patreon, PayPal, and Open Collective.