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Mastodon Updated to 4.5.1 (November 20, 2025)

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We updated C.IM to Mastodon v4.5.1.

Because C.IM is moving from the 4.4 series, this includes the Mastodon 4.5 feature release and the first 4.5 patch release.

Changes in 4.5.0

Quote Posts

Mastodon now supports quote posts across the web interface and API.

For more details:

Web Interface

  • Composer updates for quoting and reply fetching
  • Dynamic viewport height for mobile browsers
  • New “Posting defaults” page
  • New “Privacy and reach” top-level category
  • Option to block words in usernames
  • Individual settings to disable local or remote feeds
  • Link previews for admin interface
  • New server landing page configuration
  • Updated emoji rendering with Twemoji v16 and custom emoji options
  • Support for Traditional Mongolian posting language

Moderation and Admin

  • Display quote posts in Moderator UI
  • Display link previews in Admin UI
  • Better handling of blocked, muted, or quoted users
  • Spam blocking with secondary word lists
  • Better delivery failure handling and reporting

Other Improvements

  • Support for numeric-based URIs for local accounts
  • Schema.org markup for SEO-enabled posts
  • Database query optimizations
  • UI and accessibility fixes

Fixes in 4.5.1

Version 4.5.1 follows up with compatibility and bug fixes:

  • Fixed Cmd/Ctrl + Enter not submitting Alt text modal on some browsers (#36866)
  • Fixed posts from public or hashtag streams being incorrectly marked as unquotable (#36860, #36869)
  • Fixed old posts being treated as new after receiving an update (#36848)
  • Fixed blank screens in browsers lacking Intl.DisplayNames support (#36847)
  • Fixed filters not being applied to quotes in detailed view (#36843)
  • Fixed scroll shifts caused by fetch-all-replies alerts (#36807)
  • Fixed dropdown menu focus when opened via keyboard (#36804)
  • Fixed asset build issue on arch64 (#36781)
  • Fixed /api/v1/statuses/:id/context sometimes returning incomplete async refresh data (#36779)
  • Fixed prepared quotes not being discarded properly when replying (#36778)

Full release notes:

Summary

This update brings C.IM onto the Mastodon 4.5 series, including quote posts and the related moderation, API, and interface work.

We are running 4.5.1 rather than 4.5.0 so the first round of patch fixes is included from the start.

Source code: https://github.com/odotee/mastodon

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