Software⏱️ 2 min read📅 2026-06-03

How to Fix: PHP Composer update "cannot allocate memory" error (using Laravel 4)

Composer update error on Linode with low RAM

Quick Answer: Increase PHP memory limit to a higher value, such as 128M or 256M, to resolve the 'Cannot allocate memory' error.

The 'Cannot allocate memory' error when updating Composer on a Linode 1G RAM basic plan is often caused by the insufficient memory limit set in PHP.ini. Although you have set the memory limit to '-1', which allows unlimited memory, there could be other factors at play.

🛑 Root Causes of the Error

  • Insufficient RAM on your Linode instance, leading to memory constraints.
  • A faulty or corrupted PHP configuration file (PHP.ini) that is preventing Composer from functioning correctly.

🛠️ Step-by-Step Verified Fixes

Method 1: Check and Adjust PHP Configuration

  1. Step 1: Open the file located at /etc/php.ini or /etc/php7.x.ini, depending on your PHP version.
  2. Step 2: Look for the 'memory_limit' directive and adjust it to '-1' if necessary. Otherwise, set a reasonable value based on your system's available RAM.

Method 2: Upgrade Your Linode Plan

  1. Step 1: Log in to your Linode account and go to the 'Settings' page.
  2. Step 2: Click on 'Upgrade' under the 'Compute' section, selecting a plan with sufficient RAM (at least 512MB).

✨ Wrapping Up

By following these steps and adjusting your PHP configuration or Linode plan, you should be able to resolve the 'Cannot allocate memory' error when updating Composer.

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