Just started using PlatformSh so these are just instructions for me. In case I forget how to do it.
1. Lando Start
2. lando composer install
(Make sure it is there and updated)
3. lando composer update "drupal/core-*" --with-all-dependencies
(Gets the newest drupal core with composer)
4. lando drush updb -y
(Updates the database)
5. lando rebuild
(Makes it clean. :) )
If you run into a Composer memory allot issue, do this:
Run these commands
1. lando which composer
(Nothing exciting happens after running this)
2. lando php -d memory_limit=-1 /usr/bin/composer update
That should work to get the update rolling again