Phalcon/incubator now gives runtime exception on composer update

When using composer update I get the following : [RuntimeException] Failed to execute git remote set-url composer '[email protected]:phalcon/incubator.git' && git rev-parse --quiet --verify '6466f08ce755c4a4399cef8ca9ffc410398ef9a0^{commit}' || (git fetch composer && git fetch --tags composer)

Am using "phalcon/incubator": "dev-master", in composer.json