How to Fix “Failed” in composer install (2026 Guide)

The Short Answer

To fix the “Failed” error in composer install, increase the memory limit by running the command php -d memory_limit=-1 composer install or adjust the memory_limit setting in your PHP configuration. This will allow composer to allocate sufficient memory to complete the installation process.

Why This Error Happens

  • Reason 1: The most common cause of the “Failed” error in composer install is exceeding the default memory limit of 128M or 256M, depending on the PHP configuration. When composer tries to install dependencies, it requires a significant amount of memory, especially for large projects.
  • Reason 2: An edge case cause of this error is when the composer.json file contains a large number of dependencies or complex dependencies that require a lot of memory to resolve. This can happen when working with legacy projects or projects that have a large number of dependencies.
  • Impact: The “Failed” error in composer install can cause PHP to terminate abruptly, resulting in incomplete or corrupted installations, which can lead to further errors and issues down the line.

Step-by-Step Solutions

Method 1: The Quick Fix

  1. Go to php.ini > memory_limit
  2. Increase the memory_limit setting to at least 512M or 1G, depending on your system’s available memory.
  3. Restart your PHP service or reload the PHP configuration to apply the changes.

Method 2: The Command Line/Advanced Fix

You can also increase the memory limit on the fly by running the following command:

1

php -d memory_limit=-1 composer install

This will allow composer to allocate unlimited memory, which can be useful for very large projects. Alternatively, you can also adjust the memory_limit setting in your PHP configuration file (php.ini or php-cli.ini) to increase the default memory limit.

Prevention: How to Stop This Coming Back

  • Best practice configuration: Set the memory_limit setting to at least 512M or 1G in your PHP configuration file to prevent this error from happening in the future.
  • Monitoring tips: Regularly monitor your system’s memory usage and adjust the memory_limit setting as needed to prevent composer from running out of memory.

If You Can’t Fix It…

[!WARNING] If composer install keeps crashing, consider switching to npm or yarn which handles package management natively without these errors. However, keep in mind that this will require significant changes to your project’s dependencies and configuration.

FAQ

Q: Will I lose data fixing this? A: No, increasing the memory limit or adjusting the PHP configuration will not result in data loss. However, if you are using a version control system, make sure to commit your changes before making any adjustments to your PHP configuration.

Q: Is this a bug in composer install? A: No, the “Failed” error in composer install is not a bug, but rather a limitation of the default PHP configuration. Composer install is designed to work within the constraints of the PHP configuration, and increasing the memory limit is a common solution to this issue. This issue has been documented in various versions of composer, including version 2.0 and later.

📚 Continue Learning

Check out our guides on composer install and Failed.