diff --git a/docs/conf.py b/docs/conf.py
index f61689e..8a33a02 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 #
 # pyCMW documentation build configuration file, created by
 # sphinx-quickstart on Mon Sep 01 21:59:30 2014.
diff --git a/sphinx_parser/ase.py b/sphinx_parser/ase.py
index bc093de..ab38c07 100644
--- a/sphinx_parser/ase.py
+++ b/sphinx_parser/ase.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from typing import Optional
 
 import numpy as np
diff --git a/sphinx_parser/input.py b/sphinx_parser/input.py
index 95132ef..64012fd 100644
--- a/sphinx_parser/input.py
+++ b/sphinx_parser/input.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from typing import Annotated, Optional
 
 import numpy as np