How to disable automatic updates in WordPress
Starting in WordPress 3.7, it is able to automatically update your wordpress without you doing anything. Although it is only triggered when there is a minor update and if there is a visit to the site by any user.
However, some web masters may not want WordPress to auto-update. They would rather manually update it themselves.
According to WordPress Codex, add …
define( 'AUTOMATIC_UPDATER_DISABLED', true );
define( 'WP_AUTO_UPDATE_CORE', false );
to the bottom of wp-config.php
If you want auto-updates for minor and major version, use …
define( 'WP_AUTO_UPDATE_CORE', true);
If you want auto-updates only for minor version, use …
define( 'WP_AUTO_UPDATE_CORE', 'minor');