Magento 2.0.18 is the final 2.0.x release. After March 2018, Magento 2.0.x will no longer receive security patches, quality fixes, or documentation updates.
To maintain your site's performance, security, and PCI compliance, upgrade to the latest version of Magento.

Add or update components

A contributing developer updates components by specifying components and their versions in Magento’s composer.json.

To update components if you’re not a contributing developer, see Updating the Magento application and components.

You can either add a require section to composer.json or you can use the composer require command as follows:

  1. Log in to the Magento server, or switch to, the Magento file system owner.
  2. Change to the directory to which you cloned the Magento application. For example,

    cd /var/www/magento2
    

You have the following options:

Use the composer require command

Command usage:

composer require <vendor>/<name>:<version>

For example,

composer require example/module:1.0.0

Wait while Composer updates dependencies and installs the component.

Add a require section to composer.json

Open composer.json in a text editor.

Add a require section like the following:

	"require": {
		"<vendor>/<name>": "<version>",
		"<vendor>/<name>": "<version>"
	}

Save your changes to composer.json, exit the text editor, and enter composer update

For more information

If you have issues, see Composer troubleshooting.