public function do_updates() {
		$this->clear_option_caches();
		$updates = $this->get_updates();
		uksort( $updates, 'version_compare' );

		try {
			foreach ( $updates as $version => $callback ) {

				if ( ! $this->is_new_install() && version_compare( $version, $this->current_version, '<=' ) && $this->is_version_in_db_less_than( $version ) ) {
					call_user_func( $callback );
				}
			}

			foreach ( $this->constant_updates() as $callback )  {
				call_user_func( $callback );
			}

			$this->update_version_option( $this->current_version );
		} catch ( Exception $e ) {
			// fail silently, but it should try again next time
		}
	}