Fedora will ship Plasma 6 with version 40.

As a prerelease, you can easily test it by rebasing an Atomic Desktop install to “Kinoite prerelease”.

Now that 40 is branched, you may want to rebase to 40 instead of rawhide, which is already on Fedora 41.

Here I show the needed commands.

Fedora Kinoite 40 is perfectly usable for me!