Hi, >WDYM with versioned depends? as said above: "a/ virtual provides can't safisfy versioned dependencies" maintainers might be able to do something like "Depends: libpng-dev (>=1.6)". This might help future transitions (not from 12 to 16 probably). Always if I understand correctly what maintainers might want to do. And makes easier to pull the trigger, avoding two uploads at the same time and some rebuilds possibly. cheers, G.