Latest update breaks site

Warning: require_once(vendor/autoload.php): failed to open stream: No such file or directory in /var/www/html/wordpress/wp-content/plugins/restricted-site-access/restricted_site_access.php on line 16
Fatal error: require_once(): Failed opening required ‘vendor/autoload.php’ (include_path=’.:/usr/share/pear:/usr/share/php’) in /var/www/html/wordpress/wp-content/plugins/restricted-site-access/restricted_site_access.php on line 16
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