Version 5.6.0 is available upstream. Please consider updating! It seems that version 5.6.0 is available upstream, while the latest version in the Gentoo tree is 5.5.1. You think this warning is false? Read more about it here.
Yubikey Manager is a python library and command line tool for
configuring any YubiKey over all USB transports. It's a CLI
successor of yubikey-neo-manager.