When I run update of composer things for MediaWiki core, I got this:
tools.testwiki@tools-sgebastion-07:~/public_html$ composer update > ComposerHookHandler::onPreUpdate Loading composer repositories with package information Updating dependencies (including require-dev) Package operations: 0 installs, 1 update, 0 removals Package phpunit/phpunit-mock-objects is abandoned, you should avoid using it. No replacement was suggested. Generating optimized autoload files > ComposerVendorHtaccessCreator::onEvent tools.testwiki@tools-sgebastion-07:~/public_html$