Unleash the Power of Simplicity: PHP CLI App with Minimal Dependencies

I have a couple of open-source CLI apps like Rector, ECS, Class Leak, Config Transformer, Monorepo Builder and Lines, and private ones like Cleaning Checklist, Fixai, Private Rector and Entropy. All of them run in the command line, and some of them are downgraded to PHP 7.2. In every project, there is the rule, the fewer dependencies you have, the less work to maintain them. This applies twice to CLI apps distributed with scoped and downgraded /vendor included. How to achieve this goal? It's not what I thought.