In the composer.json file I added
"drupal/core": "~8.4" to the required section. When I run
composer update drupal/core --with-all-dependencies, I get the following output.
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.
- drupal/core 8.4.0 conflicts with acquia/blt-project
Why does Drupal 8.4 conflict with acquia/blt-project?