RuboCop targets Ruby 2.0+ code analysis.[1]
RuboCop officially runtime supports MRI (a.k.a. CRuby) and JRuby.
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MRI 2.7+
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JRuby 9.4+
The oldest supported JRuby version is derived from the oldest compatible MRI version.
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Note
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RuboCop might be working with other Ruby implementations as well, but it’s tested only on MRI and JRuby. |
Support Matrix
RuboCop generally aims to follow MRI’s own support policy - meaning RuboCop would support all officially supported MRI releases.[2] To give people extra time for a smooth transition, we’ve customarily provided support for about one year after EOL of MRI version. [3]
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Note
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There are major version incompatibilities between Ruby 2.7 and Ruby 3.0, and the latest stable version of Ruby on Rails, 7.1, still supports Ruby 2.7. Therefore, it might be early for RuboCop to drop support for Ruby 2.7 at this stage. As long as Rails 7.1 is in the "Bug Fix" phase of the Maintenance Policy for Ruby on Rails, RuboCop will continue supporting Ruby 2.7. |
The following table is the runtime support matrix.
| Supported runtime Ruby version | Last supported RuboCop version |
|---|---|
1.9 |
0.41 |
2.0 |
0.50 |
2.1 |
0.57 |
2.2 |
0.68 |
2.3 |
0.81 |
2.4 |
1.12 |
2.5 |
1.28 |
2.6 |
1.50 |
2.7 |
- |
3.0 |
- |
3.1 |
- |
3.2 |
- |
3.3 |
- |
3.4 (experimental) |
- |
RuboCop targets Ruby 2.0+ code analysis with Parser gem as a parser since RuboCop 1.30. It restored code analysis support that had been removed earlier by mistake, together with dropping runtime support for unsupported Ruby versions.
Starting from RuboCop 1.62, support for Prism’s Prism::Translation::parser will enable analysis of Ruby 3.3+. For more details, please refer to the setting ParserEngine.
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Note
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The compatibility setting TargetRubyVersion is about code analysis (what RuboCop can analyze), not runtime (is RuboCop capable of running on some Ruby or not).
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Forward Compatibility
Features may be provided for development version of Ruby. These are all considered experimental, and may change before the stable version of Ruby will be released.