diff --git a/requirements-tests.txt b/requirements-tests.txt
index 15fcdb6..bc6acb9 100644
--- a/requirements-tests.txt
+++ b/requirements-tests.txt
@@ -1,6 +1,7 @@
 -e .
 
 pytest >=8.3.5
+typing-extensions; python_version < "3.9"
 coverage[toml] >=7.6.1
 mypy ==1.14.1
 ruff ==0.14.1
diff --git a/tests/test_main.py b/tests/test_main.py
index b2a55d0..c85dabf 100644
--- a/tests/test_main.py
+++ b/tests/test_main.py
@@ -1,9 +1,13 @@
 import pickle
-
-from typing_extensions import Annotated, get_type_hints
+import sys
 
 from annotated_doc import Doc
 
+if sys.version_info >= (3, 9):
+    from typing import Annotated, get_type_hints
+else:
+    from typing_extensions import Annotated, get_type_hints
+
 
 def test_doc_basic() -> None:
     doc = Doc("This is a test documentation.")