Disable mail notification

Stop sending admin emails for WP update

function wpb_stop_update_emails( $send, $type, $core_update, $result ) {
	if ( ! empty( $type ) && $type == 'success' ) {
		return false;
	}
	return true;
}
add_filter( 'auto_core_update_send_email', 'wpb_stop_auto_update_emails', 10, 4 );