If you have a Drupal CMS installation version 1.0 (January 2025), you may have issues upgrading to the latest Drupal core (11.2). Neither automatic updates nor the "old fashioned" composer work.
You are not alone.
The reason for this behavior is that for 2 (automatic updates and project browser), versions included in Drupal CMS 1.0 are not compatible with Drupal core 11.2.
