Help:Installation/Troubleshooting/Your composer.lock file is not up to date

Error&#58; your composer.lock file is not up to date. Run "composer update" to install newer dependenciesCiteRef::gh:smw:2323

This is a conflict caused by MediaWiki due to how it is using "composer.json" file for its own purpose.CiteRef::mw:phab:T178453 It may occur when running MediaWiki's "update.php" maintenance script. Just add the  flag to your  command, e.g.: