Follow the below mentioned steps to uninstall Atatus in Heroku.

  1. Unset Atatus Heroku PHP extension repo

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    heroku config:unset HEROKU_PHP_PLATFORM_REPOSITORIES ATATUS_LICENSE_KEY ATATUS_APP_NAME -a YOUR_APP
    
  2. Remove Atatus Heroku extension in composer.json from the previous remote package repository.

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    {
        "require": {
            "ext-atatus": "1.10.0"
        },
        "config": {
            "platform": {
                "ext-atatus": "1.10.0"
            }
        }
    }
    
  3. Uninstall Atatus Heroku extension.

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    composer update
    
  4. Commit those changes to Heroku and deploy your application once again.

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    git add composer.json composer.lock
    git commit -m 'Add ext-atatus dependency to Heroku app'
    git push heroku master