Ruixen UI now supports Tailwind v4 and React 19 by default.
How to use Tailwind v4
You can start by going to any component and following the instructions. Try marquee for example.
How to use Tailwind v3
If you're using tailwind v3, you can head over to v3.ruixen.com and follow the instructions there.
How to upgrade your project to Tailwind v4
If you would like to upgrade your project to Tailwind v4, you can follow the steps here https://ui.shadcn.com/docs/tailwind-v4.