Mastodon 4.6 adds profile endpoints that replace update_credentials

What changed

Mastodon 4.6.0 was released on June 17, 2026. Per the changelog it adds GET and PATCH /api/v1/profile, which replace update_credentials, plus Collections API endpoints, a fallback attribute on notifications, and an alt text limit of 10,000 characters for media. The changelog does not call update_credentials deprecated, so no removal date is stated.

What it means

Profile editing moves to new GET and PATCH /api/v1/profile endpoints, and the alt text limit rises to 10,000 characters.

Who is affected

Developers of Mastodon clients and tools that edit profiles, and admins upgrading to 4.6.

What to do by 17 Jun 2026

Use the new profile endpoints for profile edits. Admins should note FFmpeg 5.1 or later is now required and Node.js 20, Ruby 3.2 and ImageMagick support were removed.