Your requirements could not be resolved to an installable set of packages. Problem 1 - bitbag/product-bundle-plugin is present at version dev-c3d02b6a459b71cb041b04dbf9e37efefa06cd5a and cannot be modified by Composer - Root composer.json requires behat/mink-selenium2-driver ^1.7 -> satisfiable by behat/mink-selenium2-driver[v1.7.0]. - bitbag/product-bundle-plugin dev-c3d02b6a459b71cb041b04dbf9e37efefa06cd5a conflicts with behat/mink-selenium2-driver v1.7.0.