Mastodon
Your self-hosted, globally interconnected microblogging community
Alternative to: Twitter/X, Threads
v4.3.12
2025-09-16[!NOTE] While we continue to support Mastodon 4.3 and release patches for it, please note that Mastodon 4.4 is available with new features, changes and fixes. We encourage administrators to update to the latest 4.4 version when they can.
Upgrade overview
This release contains upgrade notes that deviate from the norm:
ℹ️ Requires assets recompilation
For more information, view the complete release notes and scroll down to the upgrade instructions section.
Changelog
Security
- Update dependencies
Fixed
- Fix processing of remote edited statuses with new media and no text (#35970 by @unfokus)
- Fix “Edit” and “Delete & Redraft” on a poll not inserting empty option (#35892 by @ClearlyClaire)
- Fix self-destruct scheduler behavior on some Redis setups (#35823 by @ClearlyClaire)
Upgrade notes
To get the code for v4.3.12, use git fetch && git checkout v4.3.12.
[!NOTE] As always, make sure you have backups of the database before performing any upgrades. If you are using docker-compose, this is how a backup command might look:
docker exec mastodon_db_1 pg_dump -Fc -U postgres postgres > name_of_the_backup.dump
Dependencies
External dependencies have not changed since v4.3.0, the compatible Ruby, PostgreSQL, Node, Elasticsearch and Redis versions are the same, that is:
- Ruby: 3.1 or newer
- PostgreSQL: 12 or newer. PostgreSQL versions 14.0 to 14.3 are not supported as they contain a critical data-corruption bug (see v4.3.0 release notes)
- Elasticsearch (recommended, for full-text search): 7.x (OpenSearch should also work)
- LibreTranslate (optional, for translations): 1.3.3 or newer
- Redis: 4 or newer
- Node: 18 or newer
- ImageMagick (optional if using libvips): 6.9.7-7 or newer
- libvips (optional, instead of ImageMagick): 8.13 or newer
Update steps
The following instructions are for updating from 4.3.11.
If you are upgrading directly from an earlier release, please carefully read the upgrade notes for the skipped releases as well, as they often require extra steps such as database migrations. In particular, please read the v4.3.0 release notes, as there have been multiple important changes.
Non-docker
[!TIP] The
charlock_holmesgem may fail to build on some systems with recent versions ofgcc. If you run into such an issue, tryBUNDLE_BUILD__CHARLOCK_HOLMES="--with-cxxflags=-std=c++17" bundle install.
- Install dependencies with
bundle installandyarn install --immutable - Precompile the assets:
RAILS_ENV=production bundle exec rails assets:precompile - Restart all Mastodon processes.
When using docker
- Restart all Mastodon processes.