Mastodon Engineering

Our mission is to connect the world through thriving online communities.

This is the account for the software engineering and design team that makes Mastodon.

For news and updates from the overall Mastodon project, follow Mastodon (npub163h…mv0n)

For news and updates on the Mastodon servers we operate (like this one!), follow Mastodon.social Staff (npub1jhw…x4ma)

Homepage: https://joinmastodon.org
Patreon: https://patreon.com/mastodon
GitHub: https://github.com/mastodon
Documentation: https://docs.joinmastodon.org

Last Notes

2025-11-06 13:33:24 UTC

We’re happy to announce that Mastodon 4.5 is now ready for prime time! Quote posts, async fetching of replies, server timeline visibility settings, more moderation tools, and lots and lots of other tweaks and improvements.
Announcement on our blog: https://blog.joinmastodon.org/2025/11/mastodon-4.5/
Full release notes and update instructions are available on our GitHub release page: https://github.com/mastodon/mastodon/releases/tag/v4.5.0
#mastoadmin

2025-07-15 18:24:23 UTC

Our monthly #TrunkAndTidbits engineering update is out. Looking back at June: behind the scenes on the 4.4 release, as well as all the other things the team has been working on. 🎇 https://blog.joinmastodon.org/2025/07/trunk-tidbits-june-2025/

2025-07-01 15:18:17 UTC

We just tagged the release candidate for Mastodon 4.4.0 for testing. Full release notes and update instructions are available on our GitHub release page.
https://github.com/mastodon/mastodon/releases/tag/v4.4.0-rc.1

2025-03-27 17:10:12 UTC

We’re looking for a Senior Product Designer to work alongside our frontend and mobile devs.
Ideally:
1. You’re highly skilled in UX design, having led product strategy & design process
2. Proficient in Figma/Penpot, with interaction & usability design skills
3. Experienced in accessibility & privacy-conscious design
This remote fulltime position requires a 4-hour overlap with the CET timezone.
For more info/to apply:
https://jobs.ashbyhq.com/mastodon/d9e4d6d0-d360-4c86-9f04-5c14fbcab8ef
#FediHire #GetFediHired #hiring #product #designer

2025-03-13 15:28:07 UTC

- reply

If you are running Mastodon 4.1 and use SAML, we encourage you to update to a newer Mastodon version as soon as possible. We also want to remind you that Mastodon 4.1 will no longer receive patches (including for security issues) after 2024-04-08 and we strongly encourage you to update to a newer Mastodon version.

2025-03-13 15:27:36 UTC

We just released Mastodon 4.3.6, 4.2.19 and 4.1.24. They contain important security fixes.
We recommend server administrators to update as soon as possible if they use SAML, or are on the development version.
If you are using our nightly releases, a container image with the fix has been published with the nightly.2025-03-14-security tag.
Full release notes and update instructions are available on our GitHub release page:
https://github.com/mastodon/mastodon/releases/

2025-02-27 16:42:10 UTC

We just released Mastodon 4.3.4, 4.2.17 and 4.1.23. They contain bug fixes as well as security fixes (medium severity)
We recommend every instance administrator to update as soon as possible.
If you are using our nightly releases, a container image with the fix has been published with the `nightly.2025-01-27-security` tag.
Full release notes and update instructions are available on our GitHub release page: https://github.com/mastodon/mastodon/releases/
#mastoadmin

2025-01-06 17:47:55 UTC

New year, new role @npub163h…mv0n!
Our core team is looking for a senior Front-end Developer to elevate the web UI/UX experience for our users.
Ideally:
1. You are highly skilled in accessible and semantic #HTML
2. Proficient in modern #CSS
3. Experienced with #Javascript, #Typescript and complex React/Redux applications
This remote full-time position requires a 4-hour overlap with the CET timezone.
For more info/to apply:
https://jobs.ashbyhq.com/mastodon/6a0953c4-812b-4697-b5b3-ea0a2ae402c0
#FediHire #GetFediHired #hiring #frontend

2024-12-03 15:58:20 UTC

We just released Mastodon 4.3.2, 4.2.14 and 4.1.21.
They contain a few bug fixes, and we recommend every server admin to update.
Release notes and upgrade instructions are available on our GitHub Releases page: https://github.com/mastodon/mastodon/releases/
#mastoadmin

2024-10-21 12:31:14 UTC

We just released Mastodon 4.3.1!
It contains some bug fixes and a few small features, like (optional) grouping of follow notifications and improvements the fediverse:creator setup instructions.
Upgrading requires re-compiling frontend assets (if not using Docker), instructions are in the release notes : https://github.com/mastodon/mastodon/releases/tag/v4.3.1
#mastodev #mastoadmin

2024-09-17 16:48:46 UTC

We just released the second beta of Mastodon 4.3.
This version contains a security fix for an issue present in Mastodon 4.3 beta 1, (moderate severity) so we strongly suggest admins running on our beta versions to update as soon as possible.
We expect this to be the final beta, and to release our Release Candidate next week. Please open GitHub issues if you encounter anything unexpected!
https://github.com/mastodon/mastodon/releases/tag/v4.3.0-beta.2
#mastoadmin #mastodev

2024-08-23 16:43:52 UTC

We are happy to announce the first beta release of Mastodon 4.3 🎉 11 months in the works, it is chock-full of improvements, the most prominent being notification grouping and new filtering capabilities, as well as extensive usability overhauls.
Please note that this is a beta, and the stable release is still to come. If you are upgrading your server to it, read the changelog carefully, and open GitHub issues if you encounter anything unexpected.
https://github.com/mastodon/mastodon/releases/tag/v4.3.0-beta.1
#mastoadmin #mastodev

2024-08-19 12:32:33 UTC

We just released Mastodon 4.2.12, fixing a bug introduced in 4.2.11 which caused notifications for mentions from local moderator accounts to be dropped. If you updated to 4.2.11, we strongly recommend you to upgrade to 4.2.12.
Version 4.1.19 is not impacted.
Release notes and upgrade instructions are available on our GitHub Releases page: https://github.com/mastodon/mastodon/releases
#mastoadmin

2024-08-16 13:22:43 UTC

We just released Mastodon 4.2.11 and 4.1.19, fixing various small issues.
Release notes and upgrade instructions are available on our GitHub release page: https://github.com/mastodon/mastodon/releases
#mastoadmin