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

For news and updates on the Mastodon servers we operate (like this one!), follow @staff

Last Notes

2026-10-21 14:05:15 UTC

In the wake of the compromise of the eMudhra Intermediate CA, we strongly encourage all Mastodon administrators to make sure their systems are up-to-date.
For those using our official Mastodon container images, we just rebuilt them (with the same tags) so they contain the latest updates to the list of CA certificates. Please update them as soon as possible.
For more information about this compromise and ways to check if your server is impacted, please read https://emudhra.we-have-a-problem.com
#mastoadmin

2026-08-20 16:33:13 UTC

We just released Mastodon 4.7.0!
This version contains very few user-facing changes, but significantly reworks the backend code to improve security and support new protocol features.
You can read more about it on our blog: https://blog.joinmastodon.org/2026/08/mastodon-4.7/
Note for admins: the database migrations might take a long time, this is expected (see the release notes).
Release notes and upgrade instructions are available here: https://github.com/mastodon/mastodon/releases/tag/v4.7.0
#mastoadmin

2026-08-10 14:30:58 UTC

We released the first beta for Mastodon 4.7 today. It contains very few user-facing changes, but contains significant reworks of the backend code to improve security and support new protocol features.
This update includes substantial database migrations that might take up to a couple of hours on very large servers, but will not cause downtime if the upgrade instructions are followed.
Release notes and upgrade instructions are available here: https://github.com/mastodon/mastodon/releases/tag/v4.7.0-beta.1
#mastoadmin

2026-06-12 09:08:45 UTC

Following last week's beta, the first release candidate for #Mastodon 4.6 is out! 🎉
You can find all of the changes on the release page: https://github.com/mastodon/mastodon/releases/tag/v4.6.0-rc.1
We aim to publish the release next week. If you are an admin, now is a good time to upgrade to the release candidate and help us find any last minute bugs!
#MastoAdmin

2025-11-11 14:17:43 UTC

We've posted #TrunkAndTidbits for October.
It was a busy month, with a lot of coding behind the scenes to prepare for Mastodon 4.5, events and talks, Fediforum and our thoughts on packs, and some merch news. Have a read!
https://blog.joinmastodon.org/2025/11/trunk-tidbits-october-2025/