Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires samoritano/linkedin-api-php-client-v2 ^0.0.20 -> satisfiable by samoritano/linkedin-api-php-client-v2[0.0.20]. - samoritano/linkedin-api-php-client-v2 0.0.20 requires guzzlehttp/guzzle ^6.3 -> found guzzlehttp/guzzle[6.3.0, ..., 6.5.8] but it conflicts with your root composer.json require (~7.0).