diff --git a/src/jupyter_nbextensions_configurator/__init__.py b/src/jupyter_nbextensions_configurator/__init__.py
index 7a39289..0e1bf45 100644
--- a/src/jupyter_nbextensions_configurator/__init__.py
+++ b/src/jupyter_nbextensions_configurator/__init__.py
@@ -14,9 +14,17 @@
 import re
 
 import yaml
-from jupyter_server.base.handlers import APIHandler, JupyterHandler
-from jupyter_server.utils import url_path_join as ujoin
-from jupyter_server.utils import path2url
+try: 
+    # When Notebook < 7 is available, the import the Notebook handlers
+    from notebook.base.handlers import APIHandler
+    from notebook.base.handlers import IPythonHandler as JupyterHandler
+    from notebook.utils import url_path_join as ujoin
+    from notebook.utils import path2url
+except ModuleNotFoundError as e:
+    from jupyter_server.base.handlers import APIHandler, JupyterHandler
+    from jupyter_server.utils import url_path_join as ujoin
+    from jupyter_server.utils import path2url
+
 from notebook._version import version_info as nb_version_info
 from tornado import web