Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires draw/tester dev-master -> satisfiable by draw/tester[dev-master]. - draw/tester dev-master requires phpunit/phpunit ^10.0 -> found phpunit/phpunit[10.0.0, ..., 10.5.x-dev] but it conflicts with your root composer.json require (^11.3). Problem 2 - draw/tester dev-master requires phpunit/phpunit ^10.0 -> found phpunit/phpunit[10.0.0, ..., 10.5.x-dev] but it conflicts with your root composer.json require (^11.3). - draw/tester-bundle dev-master requires draw/tester ^0.11 -> satisfiable by draw/tester[0.11.x-dev (alias of dev-master)]. - draw/tester 0.11.x-dev is an alias of draw/tester dev-master and thus requires it to be installed too. - Root composer.json requires draw/tester-bundle dev-master -> satisfiable by draw/tester-bundle[dev-master].