Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires mammatus/queue dev-c7fc89954cb8df0837fc325576e765e00d788de0 -> satisfiable by mammatus/queue[dev-c7fc89954cb8df0837fc325576e765e00d788de0]. - mammatus/queue dev-c7fc89954cb8df0837fc325576e765e00d788de0 requires mammatus/app dev-master -> found mammatus/app[dev-master] but it does not match your minimum-stability.

Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires mammatus/queue dev-5/merge, found mammatus/queue[dev-c7fc89954cb8df0837fc325576e765e00d788de0] but it does not match the constraint.