From the blog:
This major release brings several new features, improvements, and bugfixes to improve your Jellyfin experience. With our faster release cadence between 10.9.0 and 10.10.0, this release should be far less daunting, so please read on for a quick peek at what's new and some important-to-know breaking changes!
You may upgrade your Jellyfin instances at any time now. For those who were running Unstable builds for testing, we thank you immensely, and you may now switch back to the Stable repository and forcibly reinstall/repull the latest version. As always, ensure you back up your Jellyfin data and configuration directories before upgrading. With a major release, it's possible you will hit a bug and want to revert, and to do so, you will need to restore from a backup.
Happy watching!