After the last update of pacman-mirrorlist package, pacman wasn’t able to read the mirror list, so I couldn’t check for other update.
Fortunately I found an easy workaround.
In the /etc/pacman.d/ directory there is a file called mirrorlist.pacnew,
To have pacman working just uncomment the mirrors of your region (or any you like) and save the file as
(Of course, you need root powers :P )
If there is another /etc/pacman.d/mirrorlist, save it as a backup (this can avoid you some troubles if the solution doesn’t solve the problem)