diff --git a/tests/test_cli_subprocess.py b/tests/test_cli_subprocess.py
index 14ab492..f2fb8ef 100644
--- a/tests/test_cli_subprocess.py
+++ b/tests/test_cli_subprocess.py
@@ -9,6 +9,8 @@ catching issues that in-process CliRunner misses:
   - exit code propagation through the OS shell
 """
 
+from __future__ import annotations
+
 import json
 import os
 import subprocess