As always, the 5 series includes the latest bug fixes from the still-maintained LTS versions 4.9 and 4.13.
About Contao 5.0
The first stable version of Contao 5.0 has been released on 18 August 2022 and will be the successor of Contao 4.13. 5.0 has been updated until 14 February 2023, after which it has been replaced by Contao 5.1.