The job was canceled because "_8_3_--prefer-lowest" failed.

Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires ock/dependency-injection dev-issue-110-prep-0, found ock/dependency-injection[dev-main, ..., dev-probe] but it does not match the constraint. Problem 2 - Root composer.json requires ock/egg dev-issue-110-prep-0, found ock/egg[dev-main, ..., dev-probe] but it does not match the constraint. Problem 3 - Root composer.json requires ock/helpers dev-issue-110-prep-0, found ock/helpers[dev-main, ..., dev-probe] but it does not match the constraint. Problem 4 - Root composer.json requires ock/testing dev-issue-110-prep-0, found ock/testing[dev-main, ..., dev-probe] but it does not match the constraint. Problem 5 - Root composer.json requires ock/class-discovery dev-issue-110-prep-0 -> satisfiable by ock/class-discovery[dev-issue-110-prep-0]. - ock/class-discovery dev-issue-110-prep-0 requires ock/helpers dev-issue-110-prep-0 -> found ock/helpers[dev-main, ..., dev-probe] but it does not match the constraint.