Your requirements could not be resolved to an installable set of packages. Problem 1 - roave/better-reflection[6.5.0, ..., 6.6.0] require nikic/php-parser ^4.15.1 -> found nikic/php-parser[v4.15.1, ..., v4.18.0] but it conflicts with your root composer.json require (^5.0.0). - roave/better-reflection 6.7.0 requires nikic/php-parser ^4.15.3 -> found nikic/php-parser[v4.15.3, ..., v4.18.0] but it conflicts with your root composer.json require (^5.0.0). - roave/better-reflection[6.8.0, ..., 6.10.0] require nikic/php-parser ^4.15.4 -> found nikic/php-parser[v4.15.4, ..., v4.18.0] but it conflicts with your root composer.json require (^5.0.0). - roave/better-reflection[6.11.0, ..., 6.12.0] require nikic/php-parser ^4.16.0 -> found nikic/php-parser[v4.16.0, v4.17.0, v4.17.1, v4.18.0] but it conflicts with your root composer.json require (^5.0.0). - roave/better-reflection[6.13.0, ..., 6.19.0] require nikic/php-parser ^4.17.1 -> found nikic/php-parser[v4.17.1, v4.18.0] but it conflicts with your root composer.json require (^5.0.0). - roave/better-reflection[6.20.0, ..., 6.23.0] require nikic/php-parser ^4.18.0 -> found nikic/php-parser[v4.18.0] but it conflicts with your root composer.json require (^5.0.0). - Root composer.json requires roave/better-reflection ^6.5.0 -> satisfiable by roave/better-reflection[6.5.0, ..., 6.23.0]. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.