Make sure that you have this in your composer.json file, if not change it to it.
"symfony/symfony": "3.4.*"
/opt/plesk/php/7.2/bin/php /usr/lib/plesk-9.0/composer.phar selfupdate
/opt/plesk/php/7.2/bin/php /usr/lib/plesk-9.0/composer.phar update symfony/symfony
/opt/plesk/php/7.2/bin/php /usr/lib/plesk-9.0/composer.phar update
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