Your requirements could not be resolved to an installable set of packages. Problem 1 - league/oauth2-server[5.1.0, ..., 5.1.6] require lcobucci/jwt ^3.1 -> found lcobucci/jwt[3.1.0, ..., 3.4.6] but it conflicts with your root composer.json require (4.1.5|^4.2|^4.3|^5.0). - Root composer.json requires league/oauth2-server 5.1.* -> satisfiable by league/oauth2-server[5.1.0, ..., 5.1.6].