ember-cli-update.json

{
    "schemaVersion": "1.0.0",
    "packages": [
        {
            "name": "ember-cli",
            "version": "3.20.0",
            "blueprints": [
                {
                    "name": "app",
                    "outputRepo": "https://github.com/ember-cli/ember-new-output",
                    "codemodsSource": "ember-app-codemods-manifest@1",
                    "isBaseBlueprint": true,
                    "options": []
                }
            ]
        }
    ]
}