Ruby 3.3: security fixes only, EOL expected March 31, 2027

The Ruby maintenance branches page lists Ruby 3.3 with status security maintenance and EOL 2027-03-31 (expected). Ruby 3.4 and Ruby 4.0 are in normal maintenance.

What it means

• No more bug-fix releases for 3.3 — only security fixes.
• After March 2027, no fixes at all.
• Gems drop old Rubies first: check your Gemfile.lock.

Example

Illustrative. Score 3.4 and 4.0 on gem compatibility, test effort and support window — then pick one target per app.

Checklist

• ☐ Find every app and image on Ruby 3.3
• ☐ Run the suite on 3.4 and 4.0
• ☐ Check gems with native extensions
• ☐ Pick one target and a date

Compare upgrade targets in a weighted decision matrix →

Source: ruby-lang.org, Ruby Maintenance Branches.