Strictly speaking, yes, but you should always update your entire system, and not exclude any packages from updating.
There was another Stable Update today — see the Stable Updates thread — and today we Plasma users upgraded to Plasma 6.3.4.
The update also included an update to qt, among other things. So it’s imperative that you would update your whole system. Below are some tips for doing it as safely as possible. 
I would also advise emptying ~/.cache/ from the tty before updating, and while completely logged out of Plasma.