I've bought Vapor edition book, but unfortunately it is written in vapor3. Do you plan to upgrade the book to valor4?

Me too... hope someone gonna answer :)

I second that idea.

I would love to see an update to the Vapor book as well. I'm not sure what the status of Kitura is since IBM's exit, so realistically Paul would only probably really need to update 1 of the 2 server side books.

I'm contemplating just following along with the book using Vapor 3 and then just reading up on the differences with Vapor 4 once I am ready to make the switch. Not sure if there would be any problems using Vapor 3 at this point.