new version

includes/class-gf-upgrade.php

@@ -9,6 +9,9 @@ if ( ! class_exists( 'GFForms' ) ) {
  * look into the post_upgrade_schema() function for a sample and instructions on how to do it.
  */
 
+/** WordPress Upgrade Functions */
+require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
+
 class GF_Upgrade {
 
 	private $versions = null;