Prevent Automatic Update Check

define( 'WP_HTTP_BLOCK_EXTERNAL', true );
define( 'AUTOMATIC_UPDATER_DISABLED', true );
define( 'WP_AUTO_UPDATE_CORE', false );

define( 'AUTOMATIC_UPDATER_DISABLED', true );
define( 'WP_AUTO_UPDATE_CORE', false );


add_filter( 'auto_update_plugin', '__return_true' );
add_filter( 'auto_update_theme', '__return_true' );

Reference: https://wordpress.stackexchange.com/questions/102554/prevent-disable-automatic-update-check