diff --git a/.travis.yml b/.travis.yml
index afc5d776..54e9c369 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,7 +7,7 @@ env:
 matrix:
   include:
     - php: 5.6
-      env: DB=MYSQL RECIPE_VERSION=1.0.x-dev PHPCS_TEST=1 PHPUNIT_TEST=1
+      env: DB=MYSQL RECIPE_VERSION=1.1.x-dev PHPCS_TEST=1 PHPUNIT_TEST=1
     #- php: 7.0
     #  env: DB=PGSQL PHPUNIT_TEST=1
     - php: 7.0
diff --git a/composer.json b/composer.json
index 370d0801..255f05ce 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
     "minimum-stability": "dev",
     "prefer-stable": true,
     "require": {
-        "silverstripe/cms": "^4.0@dev",
+        "silverstripe/cms": "^4.1",
         "symbiote/silverstripe-gridfieldextensions": "^3.1",
         "silverstripe/vendor-plugin": "^1.0"
     },
diff --git a/src/Extensions/ElementalDuplicationExtension.php b/src/Extensions/ElementalDuplicationExtension.php
index cd164044..47f8b98c 100644
--- a/src/Extensions/ElementalDuplicationExtension.php
+++ b/src/Extensions/ElementalDuplicationExtension.php
@@ -2,12 +2,16 @@
 
 namespace DNADesign\Elemental\Extensions;
 
+use SilverStripe\Core\Config\Config;
 use SilverStripe\ORM\DataExtension;
-use SilverStripe\Core\Config;
 
+/**
+ * @deprecated 2.1..3.0 This extension is not implemented by default, and will be removed
+ *                      in 3.0.0. Please use the `$owns` API with `$cascade_duplicates` instead.
+ *                      See {@link ElementalPageExtension} for an example of this.
+ */
 class ElementalDuplicationExtension extends DataExtension
 {
-
     /**
      * Duplicate items
      *
diff --git a/src/Extensions/ElementalPageExtension.php b/src/Extensions/ElementalPageExtension.php
index 174d6d45..e33273ef 100644
--- a/src/Extensions/ElementalPageExtension.php
+++ b/src/Extensions/ElementalPageExtension.php
@@ -8,18 +8,16 @@
 
 class ElementalPageExtension extends ElementalAreasExtension
 {
-    /**
-     * @var array
-     */
     private static $has_one = [
-        'ElementalArea' => ElementalArea::class
+        'ElementalArea' => ElementalArea::class,
     ];
 
-    /**
-     * @var array
-     */
     private static $owns = [
-        'ElementalArea'
+        'ElementalArea',
+    ];
+
+    private static $cascade_duplicates = [
+        'ElementalArea',
     ];
 
     /**
diff --git a/src/Models/ElementalArea.php b/src/Models/ElementalArea.php
index 3397e56a..f0f03fa1 100644
--- a/src/Models/ElementalArea.php
+++ b/src/Models/ElementalArea.php
@@ -24,51 +24,34 @@
  */
 class ElementalArea extends DataObject
 {
-    /**
-     * @var array $db
-     */
     private static $db = [
         'OwnerClassName' => 'Varchar(255)',
     ];
 
-    /**
-     * @var array $has_many
-     */
     private static $has_many = [
-        'Elements' => BaseElement::class
+        'Elements' => BaseElement::class,
     ];
 
-    /**
-     * @var array
-     */
     private static $extensions = [
-        Versioned::class
+        Versioned::class,
     ];
 
-    /**
-     * @var array
-     */
     private static $owns = [
-        'Elements'
+        'Elements',
     ];
 
-    /**
-     * @var array
-     */
     private static $cascade_deletes = [
-        'Elements'
+        'Elements',
+    ];
+
+    private static $cascade_duplicates = [
+        'Elements',
     ];
 
-    /**
-     * @var array
-     */
     private static $summary_fields = [
-        'Title' => 'Title'
+        'Title' => 'Title',
     ];
 
-    /**
-     * @var string
-     */
     private static $table_name = 'ElementalArea';
 
     /**
diff --git a/tests/ElementalAreaTest.php b/tests/ElementalAreaTest.php
index 53babaea..d6c0edcc 100644
--- a/tests/ElementalAreaTest.php
+++ b/tests/ElementalAreaTest.php
@@ -58,4 +58,17 @@ public function testCanBePublished()
         $element = $this->objFromFixture(TestElement::class, 'element1');
         $this->assertTrue($element->canPublish($member));
     }
+
+    public function testDuplicate()
+    {
+        /** @var ElementalArea $area */
+        $area = $this->objFromFixture(ElementalArea::class, 'area1');
+        $areaIds = $area->Elements()->column('ID');
+        $this->assertCount(2, $areaIds);
+
+        $duplicatedArea = $area->duplicate(true);
+        $duplicatedAreaIds = $duplicatedArea->Elements()->column('ID');
+        $this->assertCount(2, $duplicatedAreaIds);
+        $this->assertNotEquals($areaIds, $duplicatedAreaIds);
+    }
 }
diff --git a/tests/ElementalPageExtensionTest.php b/tests/ElementalPageExtensionTest.php
index 48924b14..b046bcb0 100644
--- a/tests/ElementalPageExtensionTest.php
+++ b/tests/ElementalPageExtensionTest.php
@@ -79,4 +79,22 @@ public function testGetElementalTypes()
 
         $this->assertEquals('A test element', $types[TestElement::class], 'Types should use their "type"');
     }
+
+    public function testDuplicatingPageDuplicatesElements()
+    {
+        /** @var TestPage $page */
+        $page = $this->objFromFixture(TestPage::class, 'page_with_elements');
+        $this->assertCount(2, $page->ElementalArea()->Elements());
+
+        /** @var TestPage $newPage */
+        $newPage = $page->duplicate();
+        $this->assertNotEquals($page->ElementalArea->ID, $newPage->ElementalArea->ID, 'Area is duplicated');
+        $this->assertCount(2, $newPage->ElementalArea()->Elements());
+
+        $this->assertNotEquals(
+            $page->ElementalArea()->Elements()->column('ID'),
+            $newPage->ElementalArea()->Elements()->column('ID'),
+            'Duplicated page has duplicated area and duplicated elements, i.e. not shared'
+        );
+    }
 }
diff --git a/tests/ElementalPageExtensionTest.yml b/tests/ElementalPageExtensionTest.yml
index dd2a79c7..ef99e149 100644
--- a/tests/ElementalPageExtensionTest.yml
+++ b/tests/ElementalPageExtensionTest.yml
@@ -1,11 +1,23 @@
+DNADesign\Elemental\Models\ElementalArea:
+  area51:
+    Title: Area 51
+
+DNADesign\Elemental\Models\ElementContent:
+  content1:
+    Title: Test Content
+    ParentID: =>DNADesign\Elemental\Models\ElementalArea.area51
+  content2:
+    Title: More content
+    ParentID: =>DNADesign\Elemental\Models\ElementalArea.area51
+
 DNADesign\Elemental\Tests\Src\TestPage:
   elementaldemo:
     Title: Test Elemental
+    ElementalAreaID: =>DNADesign\Elemental\Models\ElementalArea.area51
+  page_with_elements:
+    Title: Page with elements
+    ElementalAreaID: =>DNADesign\Elemental\Models\ElementalArea.area51
 
 SilverStripe\CMS\Model\RedirectorPage:
   elementredirectpage:
     Title: Redirector Page
-
-DNADesign\Elemental\Models\ElementContent:
-  content1:
-    Title: Test Content