• Information on the official website: https://github.com/ruby/www.ruby-lang.org/blob/master/_data/branches.yml

• Status: developing
• release manager: naruse
• ABI Version: 3.5.0

• Status: maintained
• release manager: k0kubun
• ABI Version: 3.4.0
• Normal maintenance: will finish on 2027-03-31
• Security maintenance: will finish on 2028-03-31

• Status: maintained
• release manager: nagachika
• ABI Version: 3.3.0
• Normal maintenance: will finish on 2026-03-31
• Security maintenance: will finish on 2027-03-31

• Status: maintained
• release manager: hsbt
• ABI Version: 3.2.0
• Normal maintenance: will finish on 2025-03-31
• Security maintenance: will finish on 2026-03-31

• Status: maintained
• release manager: hsbt
• ABI Version: 3.1.0
• Normal maintenance: will finish on 2024-03-31
• Security maintenance: will finish on 2025-03-31

• Status: EOL
• release manager: usa
• ABI Version: 3.0.0
• Release Engineering 3.0
• Normal maintenance: finished on 2023-03-31
• Security maintenance: will finish on 2024-03-31

• Status: EOL
• release manager: usa
• ABI Version: 2.7.0
• Normal maintenance: finished on 2022-03-31
• Security maintenance: finished on 2023-03-31

• Status: EOL
• release manager: usa
• ABI Version: 2.6.0
• Normal maintenance: finished on 2021-03-31
• Security maintenance: finished on 2022-03-31

• Status: EOL
• release manager: usa
• ABI Version: 2.5.0
• 2017-12-25: 2.5.0 released
• Normal maintenance: finished on 2020-03-31
• Security maintenance: finished on 2021-03-31

• Status: EOL
• release manager: usa
• ABI Version: 2.4.0
• 2016-12-24: 2.4.0 released
• Normal maintenance: finished on 2019-03-31
• Security maintenance: finished on 2020-03-31

• Status: EOL
• release manager: usa
• ABI Version: 2.3.0
• 2015-12-25: 2.3.0 released
• Normal maintenance: finished on 2018-03-31
• Security maintenance: finished on 2019-03-31

• Status: EOL
• ABI Version: 2.2.0
• 2014-12-25: 2.2.0 released
• Normal maintenance: finished on 2017-03-31
• Security maintenance: finished on 2018-03-31

• Status: EOL
• ABI Version: 2.1.0
• 2013-12-26: 2.1.0 released
• Normal maintenance: finished on 2016-03-30
• Security maintenance: finished on 2017-03-31

• Status: EOL
• ABI Version: 2.0.0
• 2013-02-24: 2.0.0-p0 released
• Normal maintenance: finished on 2015-02-24
• Security maintenance: finished on 2016-02-24

• Status: EOL
• Maintainer: usa
• ABI Version: 1.9.1
• Normal maintenance: finished on 2014-02-23
• Security maintenance: finished on 2015-02-23

• Status: EOL
• Maintainer: hone
• ABI Version: 1.9.1
• Normal maintenance: finished on June 2012
• Security fixes: finished on 2013-06-01
• Extended maintenance: finished on 2014-06-30

• Ruby 1.8 Release Plan, Ruby 1.8 Release Plan JA
• Ruby 1.8 Branch Policy and Ruby 1.8 Branch Policy JA

• Status: EOL
• Maintainer: hone
• ABI Version: 1.8
• Extended maintenance: finished on 2014-06-30

• Status: EOL
• ABI Version: 1.9.1

• Status: EOL
• ABI Version: 1.8

• Status: EOL
• ABI Version: 1.8

• Status: EOL
• ABI Version: 1.8

The History of Ruby

• The latest (unofficial) release plan discussion (2012/06/01) memo: https://twitter.com/mrkn/status/220044401433513984/photo/1/large It's only discussion. Not decided.