@since 3.8
	 *
	 * @param string $new_version New plugin version.
	 * @param string $old_version Previous plugin version.
	 *
	 * @return void
	 */
	public function update_lifespan_option_on_update( $new_version, $old_version ) {
		if ( version_compare( $old_version, '3.8', '>' ) ) {
			return;
		}

		$this->purge->update_lifespan_value(
			$this->options->get( 'purge_cron_interval' ),
			$this->options->get( 'purge_cron_unit' )
		);
	}
}