ATOW, Phinx was on the 0.8.x branch (is currently 0.10.x), and Deployer was on 4.x (currently 6.x). Make the necessary changes to the code to migrate to the newest versions.
In addition to Phinx and Deployer, PHPUnit, Silex and a lot of the underlying Symfony code needs updated for security purposes. Just gonna be a catch-all to do some tech debt cleanup of dependencies.
ATOW, Phinx was on the 0.8.x branch (is currently 0.10.x), and Deployer was on 4.x (currently 6.x). Make the necessary changes to the code to migrate to the newest versions.