diff --git a/python_jsonschema_objects/__init__.py b/python_jsonschema_objects/__init__.py
index 65508b9..22ae969 100644
--- a/python_jsonschema_objects/__init__.py
+++ b/python_jsonschema_objects/__init__.py
@@ -125,11 +125,14 @@ def file_and_memory_handler(uri):
                 DeprecationWarning,
             )
         for uri, contents in resolved.items():
+            from referencing.jsonschema import specification_with
+
+            specification = specification_with(
+                specification_uri or self.schema["$schema"]
+            )
             self.registry = self.registry.with_resource(
                 "memory:" + uri,
-                referencing.Resource.from_contents(
-                    contents, specification_uri or self.schema["$schema"]
-                ),
+                referencing.Resource.from_contents(contents, specification),
             )
 
         validatorClass = jsonschema.validators.validator_for(