Mastodon Updated to 4.5.1 (November 20, 2025)
We have updated C.IM to Mastodon v4.5.1, which includes all new features introduced in v4.5.0 and several important bug fixes.
This is a major update that adds quote posts, revamped composer, refined moderation tools, and multiple performance and UI improvements.
New Features in 4.5.0
Quote Posts
The long-awaited quote post feature is now officially supported.
Users can quote other posts with full compatibility across the web interface and API.
For more details:
Improved Web Interface
- Revamped composer with support for quoting and reply fetching
- Dynamic viewport height for better mobile experience
- New “Posting defaults” page for easier configuration
- 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
- Improved emoji rendering system with Twemoji v16 and custom emoji options
- Support for Traditional Mongolian posting language
Moderation and Admin Enhancements
- Display quote posts in Moderator UI
- Display link previews in Admin UI
- Improved handling of blocked, muted, or quoted users
- Enhanced spam blocking with secondary word lists
- Improved delivery failure handling and reporting
Other Improvements
- Support for numeric-based URIs for local accounts
- Schema.org markup for SEO-enabled posts
- Optimized database queries for better performance
- Various visual refinements in UI and accessibility updates
Fixes in 4.5.1
Version 4.5.1 focuses on stability and compatibility improvements:
- 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.DisplayNamessupport (#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/contextsometimes returning incomplete async refresh data (#36779) - Fixed prepared quotes not being discarded properly when replying (#36778)
Full release notes:
Summary
This release introduces one of the biggest user-facing changes since Mastodon 4.0, making interaction smoother and more expressive while keeping moderation and accessibility in focus.
Our instance C.IM now runs the latest, stable Mastodon version to ensure the best experience and compatibility across the Fediverse.
Source code: https://github.com/odotee/mastodon