diff --git a/code/GoogleSitemap.php b/code/GoogleSitemap.php
index 1ced914..39822bc 100644
--- a/code/GoogleSitemap.php
+++ b/code/GoogleSitemap.php
@@ -7,7 +7,7 @@ use SilverStripe\Core\Config\Config;
 use SilverStripe\Core\Object;
 use SilverStripe\ORM\ArrayList;
 use SilverStripe\ORM\DataList;
-use SilverStripe\ORM\Versioning\Versioned;
+use SilverStripe\Versioned\Versioned;
 use SilverStripe\View\ArrayData;
 
 /**
diff --git a/code/extensions/GoogleSitemapSiteTreeExtension.php b/code/extensions/GoogleSitemapSiteTreeExtension.php
index 779ef3a..1fb654e 100644
--- a/code/extensions/GoogleSitemapSiteTreeExtension.php
+++ b/code/extensions/GoogleSitemapSiteTreeExtension.php
@@ -114,7 +114,7 @@ class GoogleSitemapSiteTreeExtension extends GoogleSitemapExtension
         $priority = $this->owner->getField('Priority');
 
         if (!$priority) {
-            $parentStack = $this->owner->parentStack();
+            $parentStack = $this->owner->getAncestors();
             $numParents = is_array($parentStack) ? count($parentStack) - 1 : 0;
 
             $num = max(0.1, 1.0 - ($numParents / 10));
diff --git a/tests/GoogleSitemapTest.php b/tests/GoogleSitemapTest.php
index ac2d34d..de9c8ce 100644
--- a/tests/GoogleSitemapTest.php
+++ b/tests/GoogleSitemapTest.php
@@ -10,7 +10,7 @@ use SilverStripe\Forms\LiteralField;
 use SilverStripe\Forms\Tab;
 use SilverStripe\ORM\DataObject;
 use SilverStripe\ORM\DB;
-use SilverStripe\ORM\Versioning\Versioned;
+use SilverStripe\Versioned\Versioned;
 
 /**
  * TODO: Migrate to new instance level interface instead of using static methods for retrieval of site maps and items (i.e. ->getSitemaps() instead of ::get_sitemaps()).
@@ -20,7 +20,6 @@ use SilverStripe\ORM\Versioning\Versioned;
  */
 class GoogleSitemapTest extends FunctionalTest
 {
-
     public static $fixture_file = 'googlesitemaps/tests/GoogleSitemapTest.yml';
 
     protected $extraDataObjects = array(