Sylius install error on line 11

How fix sylius install error on line 11 ?

root@s11:/var/www/html/acme# php bin/console sylius:install
PHP Warning: require(/var/www/html/acme/vendor/autoload.php): failed to open stream: No such file or directory in /var/www/html/acme/bin/console on line 11
PHP Fatal error: require(): Failed opening required ‘/var/www/html/acme/vendor/autoload.php’ (include_path=’.:/usr/share/php’) in /var/www/html/acme/bin/console on line 11

try maybe with a composer update.