diff --git a/sphinx_automodapi/automodsumm.py b/sphinx_automodapi/automodsumm.py
index c0bd4ea..5798123 100644
--- a/sphinx_automodapi/automodsumm.py
+++ b/sphinx_automodapi/automodsumm.py
@@ -112,12 +112,12 @@ class members that are inherited from a base class. This value can be
 from sphinx.ext.autosummary import Autosummary
 from sphinx.ext.inheritance_diagram import InheritanceDiagram, InheritanceGraph, try_import
 
-from .utils import find_mod_objs, cleanup_whitespace
+from .utils import find_mod_objs, cleanup_whitespace, SPHINX_LT_8_3
 
 __all__ = ['Automoddiagram', 'Automodsumm', 'automodsumm_to_autosummary_lines',
            'generate_automodsumm_docs', 'process_automodsumm_generation']
 logger = logging.getLogger(__name__)
-SPHINX_LT_8_2 = Version(sphinx.__version__) < Version("8.2.dev")
+SPHINX_LT_8_2 = Version(sphinx.__version__) < Version("8.2")
 
 
 def _str_list_converter(argument):
@@ -219,7 +219,8 @@ def run(self):
 
     def get_items(self, names):
 
-        self.bridge.genopt.imported_members = True
+        if SPHINX_LT_8_3:
+            self.bridge.genopt.imported_members = True
 
         return Autosummary.get_items(self, names)
 
@@ -479,13 +480,14 @@ def generate_automodsumm_docs(lines, srcfn, app=None, suffix='.rst',
     """
 
     from sphinx.jinja2glue import BuiltinTemplateLoader
-    from sphinx.ext.autosummary import import_by_name, get_documenter
+    from sphinx.ext.autosummary import import_by_name
     from sphinx.util.osutil import ensuredir
     from sphinx.util.inspect import safe_getattr
     from jinja2 import FileSystemLoader, TemplateNotFound
     from jinja2.sandbox import SandboxedEnvironment
 
     from .utils import find_autosummary_in_lines_for_automodsumm as find_autosummary_in_lines
+    from .utils import get_documenter
 
     # Create our own templating environment - here we use Astropy's
     # templates rather than the default autosummary templates, in order to
diff --git a/sphinx_automodapi/utils.py b/sphinx_automodapi/utils.py
index 7cf8c4b..d738f40 100644
--- a/sphinx_automodapi/utils.py
+++ b/sphinx_automodapi/utils.py
@@ -4,10 +4,15 @@
 from inspect import ismodule
 from warnings import warn
 
+import sphinx
+from packaging.version import Version
 from sphinx.ext.autosummary.generate import find_autosummary_in_docstring
 
 __all__ = ['cleanup_whitespace',
-           'find_mod_objs', 'find_autosummary_in_lines_for_automodsumm']
+           'find_mod_objs', 'find_autosummary_in_lines_for_automodsumm',
+           'get_documenter']
+
+SPHINX_LT_8_3 = Version(sphinx.__version__) < Version("8.3.dev")
 
 # We use \n instead of os.linesep because even on Windows, the generated files
 # use \n as the newline character.
@@ -227,3 +232,27 @@ def find_autosummary_in_lines_for_automodsumm(lines, module=None, filename=None)
             continue
 
     return documented
+
+
+# This used to be in Sphinx proper but removed in
+# https://github.com/sphinx-doc/sphinx/pull/13985
+def get_documenter(app, obj, parent):
+    """Get an autodoc.Documenter class suitable for documenting the given
+    object.
+
+    *obj* is the Python object to be documented, and *parent* is an
+    another Python object (e.g. a module or a class) to which *obj*
+    belongs to.
+    """
+    if SPHINX_LT_8_3:
+        from sphinx.ext.autosummary import get_documenter
+
+        retval = get_documenter(app, obj, parent)
+
+    else:
+        from sphinx.ext.autosummary import _get_documenter
+
+        obj_type = _get_documenter(obj, parent)
+        retval = app.registry.documenters[obj_type]
+
+    return retval