D8 to D9 upgrade - ben600324/wiki GitHub Wiki
https://www.drupal.org/docs/upgrading-drupal/upgrading-from-drupal-8-to-drupal-9-or-later https://www.drupal.org/docs/updating-drupal/troubleshooting-database-updates https://www.drupal.org/project/drupal/issues/2965979
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install upgrade status to scan modules to find out incompatible module
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if module caused some issue, we can remove it from composer.json and then re-install after upgraded
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uninstall kint
ddev drush cdel core.extension module.kint -
update drush to 10
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update custom module and custom themes
core_version_requirement: ^8.8 || ^9 -
- composer remove drush/drush
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- composer require _D9_compitable_version_of_modules
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- composer require _D9_compitable_version_of_modules
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- composer require 'drupal/core-recommended:^9' 'drupal/core-composer-scaffold:^9' 'drupal/core-project-message:^9' --update-with-dependencies --no-update
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- composer update