I do wonder. I made a webpage for a friend once with Blocs 4 and Bootstrap 4, using Volt CMS amongst other great Brics. Meanwhile there have been quite a few updates to Bootstrap (even version 4), as well as to Volt CMS.
I do not dare to simply update the old site using Blocs 5 and all the updates some of the brics I used had in the last 2 years.
How do you engage this “issue” with client sites? And how often do you do it? Regularly, like on a yearly basis? Only when the client wants / needs it, or when changes to the site need to be made anyway?