emdMB:szc erin$ statamic update
PHP Fatal error: Uncaught Error: Class 'Symfony\Component\Process\ProcessBuilder' not found in /Users/erin/.composer/vendor/statamic/cli/src/Please.php:27
Stack trace:
#0 /Users/erin/.composer/vendor/statamic/cli/src/UpdateCommand.php(36): Statamic\Cli\Please->run('update')