Disable autoupdates in WordPress 3.7+.
<?php
# Disables all kind of file modifications:
# core, plugins and themes won't be auto-updated
# and file editors won't appear anymore in wp-admin.
define( 'DISALLOW_FILE_MODS', true );
# Disables all core updates:
define( 'WP_AUTO_UPDATE_CORE', false );
# Enables all core updates, including minor and major:
//define( 'WP_AUTO_UPDATE_CORE', true );
# Enables core updates for minor releases (default):
//define( 'WP_AUTO_UPDATE_CORE', 'minor' );