DEP: workaround deprecation

myst_nb/core/read.py

@@ -57,8 +57,11 @@ def create_nb_reader(
     :returns: the notebook reader, and the (potentially modified) MdParserConfig,
         or None if the input cannot be read as a notebook.
     """
-    # the import is here so this module can be loaded without sphinx
-    from importlib import import_module
+
+    try:
+        from sphinx.util._importer import import_object
+    except ImportError:
+        from sphinx.util import import_object
 
     # get all possible readers
     readers = nb_config.custom_formats.copy()
@@ -71,7 +74,7 @@ def create_nb_reader(
         if Path(path).suffix == suffix:
             if isinstance(reader, str):
                 # attempt to load the reader as an object path
-                reader = import_module(reader)
+                reader = import_object(reader)
             if commonmark_only:
                 # Markdown cells should be read as Markdown only
                 md_config = dc.replace(md_config, commonmark_only=True)