diff --git a/code/Controllers/CMSMain.php b/code/Controllers/CMSMain.php
index 8e8e37ce..f527f40a 100644
--- a/code/Controllers/CMSMain.php
+++ b/code/Controllers/CMSMain.php
@@ -734,7 +734,7 @@ class CMSMain extends LeftAndMain implements CurrentPageIdentifier, PermissionPr
         return $this
             ->getResponse()
             ->addHeader('Content-Type', 'application/json')
-            ->setBody(Convert::raw2json($data));
+            ->setBody(json_encode($data));
     }
 
     /**
@@ -859,7 +859,7 @@ class CMSMain extends LeftAndMain implements CurrentPageIdentifier, PermissionPr
         return $this
             ->getResponse()
             ->addHeader('Content-Type', 'application/json')
-            ->setBody(Convert::raw2json($statusUpdates));
+            ->setBody(json_encode($statusUpdates));
     }
 
     public function CanOrganiseSitetree()
@@ -927,7 +927,7 @@ class CMSMain extends LeftAndMain implements CurrentPageIdentifier, PermissionPr
             'filters' => $searchParams ?: new \stdClass // stdClass maps to empty json object '{}'
         ];
 
-        return Convert::raw2json($schema);
+        return json_encode($schema);
     }
 
     /**
@@ -1161,7 +1161,7 @@ class CMSMain extends LeftAndMain implements CurrentPageIdentifier, PermissionPr
 
         $this->extend('updateSiteTreeHints', $def);
 
-        $json = Convert::raw2json($def);
+        $json = json_encode($def);
         $cache->set($cacheKey, $json);
 
         return $json;
@@ -1573,7 +1573,7 @@ class CMSMain extends LeftAndMain implements CurrentPageIdentifier, PermissionPr
         return $this
             ->getResponse()
             ->addHeader('Content-Type', 'application/json; charset=utf-8')
-            ->setBody(Convert::raw2json($disallowedChildren));
+            ->setBody(json_encode($disallowedChildren));
     }
 
     /**
diff --git a/code/Forms/SiteTreeURLSegmentField.php b/code/Forms/SiteTreeURLSegmentField.php
index 76b82d7c..9b7da4b9 100644
--- a/code/Forms/SiteTreeURLSegmentField.php
+++ b/code/Forms/SiteTreeURLSegmentField.php
@@ -87,7 +87,7 @@ class SiteTreeURLSegmentField extends TextField
         }
 
         Controller::curr()->getResponse()->addHeader('Content-Type', 'application/json');
-        return Convert::raw2json(array('value' => $page->URLSegment));
+        return json_encode(array('value' => $page->URLSegment));
     }
 
     /**
diff --git a/code/Model/SiteTree.php b/code/Model/SiteTree.php
index 85be8e33..be216d8e 100755
--- a/code/Model/SiteTree.php
+++ b/code/Model/SiteTree.php
@@ -2736,7 +2736,7 @@ class SiteTree extends DataObject implements PermissionProvider, i18nEntityProvi
         $treeTitle = sprintf(
             "<span class=\"jstree-pageicon page-icon class-%s\"></span><span class=\"item\" data-allowedchildren=\"%s\">%s</span>",
             Convert::raw2htmlid(static::class),
-            Convert::raw2att(Convert::raw2json($children)),
+            Convert::raw2att(json_encode($children)),
             Convert::raw2xml(str_replace(array("\n","\r"), "", $this->MenuTitle))
         );
         foreach ($flags as $class => $data) {
diff --git a/tests/php/Controllers/CMSMainTest.php b/tests/php/Controllers/CMSMainTest.php
index 35eed3c2..4d1a5e12 100644
--- a/tests/php/Controllers/CMSMainTest.php
+++ b/tests/php/Controllers/CMSMainTest.php
@@ -57,7 +57,7 @@ class CMSMainTest extends FunctionalTest
         $this->assertNotNull($rawHints);
 
         $rawHints = preg_replace('/^"(.*)"$/', '$1', Convert::xml2raw($rawHints));
-        $hints = Convert::json2array($rawHints);
+        $hints = json_decode($rawHints, true);
 
         $this->assertArrayHasKey('Root', $hints);
         $this->assertArrayHasKey('Page', $hints);
@@ -137,7 +137,7 @@ class CMSMainTest extends FunctionalTest
         $actions = CMSBatchActionHandler::config()->batch_actions;
         if (isset($actions['publish'])) {
             $response = $this->get('admin/pages/batchactions/publish?ajax=1&csvIDs=' . implode(',', array($page1->ID, $page2->ID)));
-            $responseData = Convert::json2array($response->getBody());
+            $responseData = json_decode($response->getBody(), true);
             $this->assertArrayHasKey($page1->ID, $responseData['modified']);
             $this->assertArrayHasKey($page2->ID, $responseData['modified']);
         }