• Decide planned release date:
• Solve sub-tasks
• Check for deprecations to announce or code to remove
  • languagesearch API has major changes (in progress) T408821
  • Branch to use for release: https://gerrit.wikimedia.org/g/mediawiki/extensions/Translate/+/refs/heads/mleb-2026.01
• Update milkshake libraries in ULS
  • jQuery.uls
  • jQuery.ime
  • jQuery.webfonts
• Update language name search database
• Update version numbers
• Update test instances
• Test
• Package
• Write release notes: https://www.mediawiki.org/wiki/MediaWiki_Language_Extension_Bundle/2026.01
• Announcement:

Testing checklist on Google Sheets

Previous release: T373171: Release MLEB 2025.01 (or 03)