vagrant@growth:/vagrant/mediawiki$ composer --version Composer version 1.10.17 2020-10-30 22:31:58 vagrant@growth:/vagrant/mediawiki$ composer update > ComposerHookHandler::onPreUpdate Loading composer repositories with package information Updating dependencies (including require-dev) [Composer\DependencyResolver\SolverProblemsException] Problem 1 - The requested package monolog/monolog ^1.22 exists as monolog/monolog[2.0.2] but these are rejected by your constraint.
Caused by rMW1fa599c3772d: Updating monolog/monolog (1.25.3 => 2.0.2) / T242751: Update monolog/monolog to 2.1.1 or later, presumably.
All libraries used by MediaWiki, and probably all extensions, need their dependency declarations updated to allow for 2.0.