KaOS is a KDE Plasma-oriented rolling distro and it always ships with the most recent version of the popular and modern desktop environment.
Powered by Linux kernel 5.11, KaOS 2021.03 users the KDE Plasma 5.21 series by default, along with the KDE Frameworks 5.80 and KDE Applications 20.12.3 open-source software suites. On top of that, the KaOS 2021.03 release comes with a new version of the kcp command-line utility for installing and managing KaOS community packages that has been rewritten from the ground up to support configuration via the config files located in the $HOME/.config/kcp/ directory.