My website is built with Drupal 8.3.2. I want to update to to Drupal 8.9.x, but I don't want to move to Drupal 9.x. I ran the following command.

composer update drupal/core-recommended:8.9 --with-dependencies

I am getting these errors. The site uses PHP 7.3.33.

Could not load package centreon/centreon in http://repo.packagist.org: [UnexpectedValueException] Could not parse version constraint optimize-browser-configuration-dev: Invalid version string "optimize-browser-configuration-dev"

I tried to install centreon/centreon, but there is no package.

Can anybody help me with resolving this issue?

This is the content of the composer.json file used for the site.

    "name": "drupal/drupal",
    "description": "Drupal is an open source content management platform powering millions of websites and applications.",
    "type": "project",
    "license": "GPL-2.0+",
    "require": {
        "composer/installers": "^1.9",
        "wikimedia/composer-merge-plugin": "^1.4"
    "replace": {
        "drupal/core": "^8.3"
    "minimum-stability": "dev",
    "prefer-stable": true,
    "config": {
        "preferred-install": "dist",
        "autoloader-suffix": "Drupal8"
    "extra": {
        "_readme": [
            "By default Drupal loads the autoloader from ./vendor/autoload.php.",
            "To change the autoloader you can edit ./autoload.php.",
            "This file specifies the packages.drupal.org repository.",
            "You can read more about this composer repository at:",
        "merge-plugin": {
            "include": [
            "recurse": false,
            "replace": false,
            "merge-extra": false
        "installer-paths": {
            "core": ["type:drupal-core"],
            "modules/contrib/{$name}": ["type:drupal-module"],
            "profiles/contrib/{$name}": ["type:drupal-profile"],
            "themes/contrib/{$name}": ["type:drupal-theme"],
            "drush/contrib/{$name}": ["type:drupal-drush"],
            "modules/custom/{$name}": ["type:drupal-custom-module"],
            "themes/custom/{$name}": ["type:drupal-custom-theme"]
    "autoload": {
        "psr-4": {
            "Drupal\\Core\\Composer\\": "core/lib/Drupal\Core/Composer"
    "scripts": {
        "pre-autoload-dump": "Drupal\\Core\\Composer\\Composer::preAutoloadDump",
        "post-autoload-dump": [
        "post-package-install": "Drupal\\Core\\Composer\\Composer::vendorTestCodeCleanup",
        "post-package-update": "Drupal\\Core\\Composer\\Composer::vendorTestCodeCleanup"
    "repositories": [
            "type": "composer",
            "url": "https://packages.drupal.org/8"
  • 1
    What's the output of composer why centreon/centreon? Mar 12, 2022 at 9:52
  • [InvalidArgumentException] Could not find package "centreon/centreon" in your project Mar 12, 2022 at 9:55
  • 1
    So you have a ghost package somewhere. Assuming you have backed up everything, delete composer.lock and the entire vendor folder; then try composer update again. Mar 12, 2022 at 9:58
  • I tried but same issue again... Could not load package centreon/centreon in repo.packagist.org: Mar 12, 2022 at 10:03
  • If you're on linux or macOS, try grepping the directory that contains the codebase: grep "centreon" * -r Mar 12, 2022 at 10:20

1 Answer 1


I followed these steps to resolve issue.

Step 1 : Downgrade Composer to 1.10.9

composer self-update 1.10.9

Step 2 : Run below command

composer require drupal/pathauto:^1.6

Step 3 : Run below command

composer remove --dev webflo/drupal-core-require-dev

Step 4 : Run below command

composer require --update-with-dependencies

Step 5 : Run below command

composer require --dev --update-with-dependencies

Step 6 : Run below Command

composer remove -n

Step 7 : Run below command

drush updb

Step 8 : Run below command

drush cr

Step 9 : Update settings.php

In Drupal 8.8.0 the sync directory is defined in $settings and not $config_directories, and so the Settings.php file should be updated.

change from:

$config_directories['sync'] = 'foo/bar';


$settings['config_sync_directory'] = 'foo/bar';

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.