diff --git a/core/modules/language/migration_templates/default_language.yml b/core/modules/language/migration_templates/default_language.yml
index 9c1ac63..7af3f9c 100644
--- a/core/modules/language/migration_templates/default_language.yml
+++ b/core/modules/language/migration_templates/default_language.yml
@@ -14,15 +14,17 @@ process:
       source: language_default
       default_value:
         'language': 'en'
+    # Let's encode and decode to get rid of the default language stdClass.
     -
       plugin: callback
-      callable: json_encode
+      callable:
+        - '\Drupal\Component\Serialization\Json'
+        - 'encode'
     -
       plugin: callback
-      callable: json_decode
-    -
-      plugin: callback
-      callable: get_object_vars
+      callable:
+        - '\Drupal\Component\Serialization\Json'
+        - 'decode'
     -
       plugin: extract
       index: