Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires friendsofsymfony/oauth-server-bundle >2.0.0-alpha.0 ^2.0@dev -> satisfiable by friendsofsymfony/oauth-server-bundle[2.0.x-dev (alias of dev-master)]. - friendsofsymfony/oauth-server-bundle dev-master requires symfony/dependency-injection ^4.4 || ^5.1 -> found symfony/dependency-injection[v4.4.0, ..., v4.4.49, v5.1.0, ..., v5.4.44] but these were not loaded, likely because it conflicts with another require. - friendsofsymfony/oauth-server-bundle 2.0.x-dev is an alias of friendsofsymfony/oauth-server-bundle dev-master and thus requires it to be installed too.