I’d just like to point out that it is generally a good idea to update the system first, then the AUR packages.
In this case, I’d recommend sudo pacman -Syu followed with pamac upgrade -a … you could combine those as a one-liner using && for example, if you wish.
Yes, I want to force refresh because mirrors are not always synchronized.
I can launch pacman -Syu some_app and system says there is nothing new.
But I know version is released. So I launch pacman -Syyuu some_app and it’s updated as it should.
Later I added downloading of mirror list in front of this command and save this one-liner it in my .bashrc as alias
alias sup="sudo pacman-mirrors --fasttrack && sudo pacman -Syyuu"