We just released Mastodon 4.5.1
This version fixes some bugs found in 4.5.0.
Full release notes and update instructions are available on the GitHub release page.
Your self-hosted, globally interconnected microblogging community - Release v4.5.1 · mastodon/mastodon
GitHub (github.com)
The first beta release of Mastodon 4.5.0 is ready for testing!
Quote posts are finally here, as well as automated fetching of remote replies and a lot of other improvements.
For server moderators, there is also a way to block registrations based on keywords appearing in usernames.
Please test it out and provide feedback 
If all goes well, we plan to release the final 4.5.0 version within the next 3 weeks.
Your self-hosted, globally interconnected microblogging community - Release v4.5.0-beta.1 · mastodon/mastodon
GitHub (github.com)
We just released Mastodon 4.4.6, 4.3.14, and 4.2.27.
These versions contain security fixes, as well as a few other bugfixes mostly related to handling of quote posts.
Full release notes and update instructions are available on the GitHub releases page.
Your self-hosted, globally interconnected microblogging community - Releases · mastodon/mastodon
GitHub (github.com)