composer update drupal/core --with-dependencies
Your requirements could not be resolved to an installable set of packages.
Problem 1 - don't install drupal/core 8.7.4|remove drupal/drupal No version set (parsed as 1.0.0) - remove drupal/drupal No version set (parsed as 1.0.0)|remove drupal/core 8.7.4 - don't install drupal/core 8.7.4|remove drupal/drupal No version set (parsed as 1.0.0) - Installation request for drupal/drupal No version set (parsed as 1.0.0) -> satisfiable by drupal/drupal[No version set (parsed as 1.0.0)]. - Installation request for drupal/core ^8.7.4 -> satisfiable by drupal/core[8.7.4].
Removed the following from my composer.json:
"merge-plugin": {
"include": [
"core/composer.json"
],
"recurse": false,
"replace": false,
"merge-extra": false
},