"--add-ca-certificates" is currently supported option described in "Build options" https://snapcraft.io/docs/build-options But actually snapcraft 7.2.9 makes error as follows $ snapcraft --add-ca-certificates /etc/ssl/certs Usage: snapcraft [options] command [args]... Try 'snapcraft pack -h' for help. Error: unrecognized arguments: --add-ca-certificates I confirmed this option has been unavailable since 7.0. Due to this, packages cannot be installed from private package repository with self-signed SSL certificate.