If you have an already installed opencart store and you want to add new libraries or update the olde ones for security reasons (if they do not break everything), this is a possible alternative solution. Copy the composer.json from a fresh package of your Opencart Version ( You can find all the older versions opencart on bnit.it ) in the "storage" folder. The /storage/ folder, that is usually under the web root or in the system folder. Depends on your configuration. The following is the content of composer.json for opencart 3.0.3.8 { "name": "opencart/opencart", "type": "project", "description": "OpenCart", "keywords": ["opencart", "ecommerce", "framework", "opensource"], "homepage": "http://www.opencart.com", "license": "GPL-3.0+", "config": { "vendor-dir": "./upl