Today we release Serendipity 2.5-beta1!
The main focus was support for PHP 8.2 - if you need a serendipity version that works with PHP 8.2, you should use this beta even on a production blog. But it's still a beta, additional testing is needed to make this version a proper stable release, so stick to test environments otherwise.
Please help us in making the 2.5 stable release soon by reporting bugs and issues, or even better by providing patches to Github (the core or the plugins).