I have disabled ALL extensions (3rd party and 1st party) excluding "English". When I run the upgrade command it says "Nothing to install or update".
[~/flarum]# composer update --prefer-dist --no-dev -a --with-all-dependencies
Loading composer repositories with package information
Updating dependencies
Nothing to install or update
Package mtdowling/cron-expression is abandoned, you should avoid using it. Use dragonmantank/cron-expression instead.
Package oyejorge/less.php is abandoned, you should avoid using it. No replacement was suggested.
Package zendframework/zend-diactoros is abandoned, you should avoid using it. Use laminas/laminas-diactoros instead.
Package zendframework/zend-escaper is abandoned, you should avoid using it. Use laminas/laminas-escaper instead.
Package zendframework/zend-httphandlerrunner is abandoned, you should avoid using it. Use laminas/laminas-httphandlerrunner instead.
Package zendframework/zend-stratigility is abandoned, you should avoid using it. Use laminas/laminas-stratigility instead.
Generating optimized autoload files
Carbon 1 is deprecated, see how to migrate to Carbon 2.
https://carbon.nesbot.com/docs/#api-carbon-2
You can run './vendor/bin/upgrade-carbon' to get help in updating carbon and other frameworks and libraries that depend on it.