Description of problem: Fedora is switching from yum to dnf and so should fedpkg. Version-Release number of selected component (if applicable): 1.20-2.fc23 How reproducible: always, see package dependencies and source code.
fedpkg does not use yum or directly pull it in. Anything that is pulling in yum would need updating, it is not as simple as switching import yum for import dnf. but there is no bug to be fixed in fedpkg.