diff --git a/requirements.txt b/requirements.txt
index 502f4ff..5b3ab96 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,8 +1,10 @@
+# Dependencies for old python versions
 pre-commit  == 3.5.0; python_version < '3.9'
 pytest      == 7.4.4; python_version < '3.10'
 sphinx      == 7.4.7; python_version == '3.9'
 sphinx      == 7.1.2; python_version == '3.8'
 
+# Current dependencies
 pre-commit  == 4.0.1; python_version >= '3.9'
 pytest      == 8.3.3; python_version >= '3.10'
 sphinx      == 8.1.3; python_version >= '3.10'
diff --git a/src/sphinx_exec_code/sphinx_api.py b/src/sphinx_exec_code/sphinx_api.py
index 9a03eb5..fb13f0d 100644
--- a/src/sphinx_exec_code/sphinx_api.py
+++ b/src/sphinx_exec_code/sphinx_api.py
@@ -1,6 +1,6 @@
 import os
 from pathlib import Path
-from typing import Any
+from typing import Any, Dict
 
 from sphinx.application import Sphinx as SphinxApp
 
@@ -19,7 +19,7 @@ def builder_ready(app: SphinxApp) -> None:
     SET_UTF8_ENCODING.from_app(app)
 
 
-def setup(app) -> dict[str, Any]:
+def setup(app) -> Dict[str, Any]:
     """ Register sphinx_execute_code directive with Sphinx """
 
     confdir = Path(app.confdir)