diff --git a/sphinx_autobuild/__main__.py b/sphinx_autobuild/__main__.py
index 519259c..236912d 100644
--- a/sphinx_autobuild/__main__.py
+++ b/sphinx_autobuild/__main__.py
@@ -1,5 +1,7 @@
 """Entrypoint for ``python -m sphinx_autobuild``."""
 
+from __future__ import annotations
+
 import argparse
 import shlex
 import sys
diff --git a/sphinx_autobuild/build.py b/sphinx_autobuild/build.py
index 678737b..2fa81d6 100644
--- a/sphinx_autobuild/build.py
+++ b/sphinx_autobuild/build.py
@@ -1,5 +1,7 @@
 """Logic for interacting with sphinx-build."""
 
+from __future__ import annotations
+
 import subprocess
 import sys
 
diff --git a/sphinx_autobuild/filter.py b/sphinx_autobuild/filter.py
index 0e7a09f..eb46dbe 100644
--- a/sphinx_autobuild/filter.py
+++ b/sphinx_autobuild/filter.py
@@ -1,5 +1,7 @@
 """Logic for ignoring paths."""
 
+from __future__ import annotations
+
 import fnmatch
 import re
 from pathlib import Path
diff --git a/sphinx_autobuild/utils.py b/sphinx_autobuild/utils.py
index 2693be3..16e19fb 100644
--- a/sphinx_autobuild/utils.py
+++ b/sphinx_autobuild/utils.py
@@ -1,5 +1,7 @@
 """Generic utilities."""
 
+from __future__ import annotations
+
 import shlex
 import socket
 import threading