diff --git a/src/Api/ApigeeX/Normalizer/AppGroupMembershipNormalizer.php b/src/Api/ApigeeX/Normalizer/AppGroupMembershipNormalizer.php
index 91dc21fa..280a358a 100644
--- a/src/Api/ApigeeX/Normalizer/AppGroupMembershipNormalizer.php
+++ b/src/Api/ApigeeX/Normalizer/AppGroupMembershipNormalizer.php
@@ -48,4 +48,14 @@ public function supportsNormalization($data, $format = null): bool
     {
         return $data instanceof AppGroupMembership;
     }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getSupportedTypes(?string $format): array
+    {
+        return [
+            AppGroupMembership::class => true,
+        ];
+    }
 }
diff --git a/src/Api/Management/Normalizer/CompanyMembershipNormalizer.php b/src/Api/Management/Normalizer/CompanyMembershipNormalizer.php
index 67336459..8e36875d 100644
--- a/src/Api/Management/Normalizer/CompanyMembershipNormalizer.php
+++ b/src/Api/Management/Normalizer/CompanyMembershipNormalizer.php
@@ -41,7 +41,7 @@ public function normalize($object, $format = null, array $context = []): array|s
 
         // convert to ArrayObject as symfony normalizer throws error for std object.
         // set ARRAY_AS_PROPS flag as we need entries to be accessed as properties.
-        return new ArrayObject($normalized, ArrayObject::ARRAY_AS_PROPS);
+        return new \ArrayObject($normalized, \ArrayObject::ARRAY_AS_PROPS);
     }
 
     /**
diff --git a/src/Normalizer/CredentialProductNormalizer.php b/src/Normalizer/CredentialProductNormalizer.php
index 49a5354b..3e43bf23 100644
--- a/src/Normalizer/CredentialProductNormalizer.php
+++ b/src/Normalizer/CredentialProductNormalizer.php
@@ -42,7 +42,7 @@ public function normalize($object, $format = null, array $context = []): array|s
 
         // Need to convert to ArrayObject as symfony normalizer throws error for std object.
         // Need to set ARRAY_AS_PROPS flag as we need Entries to be accessed as properties.
-        return new ArrayObject($asObject, ArrayObject::ARRAY_AS_PROPS);
+        return new \ArrayObject($asObject, \ArrayObject::ARRAY_AS_PROPS);
     }
 
     /**
diff --git a/src/Normalizer/ObjectNormalizer.php b/src/Normalizer/ObjectNormalizer.php
index 3a4ef973..666690f6 100644
--- a/src/Normalizer/ObjectNormalizer.php
+++ b/src/Normalizer/ObjectNormalizer.php
@@ -129,10 +129,10 @@ public function setSerializer(SerializerInterface $serializer): void
     /**
      * {@inheritDoc}
      */
-    public function convertToArrayObject($normalized, $array_as_props = ArrayObject::ARRAY_AS_PROPS)
+    public function convertToArrayObject($normalized, $array_as_props = \ArrayObject::ARRAY_AS_PROPS)
     {
         // default set ARRAY_AS_PROPS flag as we need entries to be accessed as properties.
-        return new ArrayObject($normalized, $array_as_props);
+        return new \ArrayObject($normalized, $array_as_props);
     }
 
     /**
diff --git a/src/Normalizer/PropertiesPropertyNormalizer.php b/src/Normalizer/PropertiesPropertyNormalizer.php
index 5c345d0a..eb66bbd9 100644
--- a/src/Normalizer/PropertiesPropertyNormalizer.php
+++ b/src/Normalizer/PropertiesPropertyNormalizer.php
@@ -41,7 +41,7 @@ public function normalize($object, $format = null, array $context = []): array|s
 
         // convert to ArrayObject as symfony normalizer throws error for std object.
         // set ARRAY_AS_PROPS flag as we need entries to be accessed as properties.
-        return new ArrayObject($return, ArrayObject::ARRAY_AS_PROPS);
+        return new \ArrayObject($return, \ArrayObject::ARRAY_AS_PROPS);
     }
 
     /**