howto remove old package version

[niya levi via arch-general <arch-general@xxxxxxxxxxxxx>]

hi everyone

pacman -Syu
:: Starting full system upgrade...

warning: mesa: local (13.0.0rc2-2) is newer than extra (12.0.3-3.1)
warning: mesa-libgl: local (13.0.0rc2-2) is newer than extra (12.0.3-3.1)

how do i remove old version and install new with pacman,
have tried pacman -R but had dependency problems.
shadrock