diff --git a/tests/test_assets.py b/tests/test_assets.py
index 87165cf..bd5051f 100644
--- a/tests/test_assets.py
+++ b/tests/test_assets.py
@@ -2,6 +2,7 @@
 
 import os
 import re
+import sys
 from pathlib import Path
 
 import pytest
@@ -64,6 +65,7 @@ def test_custom_rtd_assets(app: Sphinx) -> None:
     assert any(re.search("_static/rtd-docsearch-custom.css", str(i)) for i in css)
 
 
+@pytest.mark.skipif(sys.version_info < (3,9), reason="requires at least Python 3.9")
 @pytest.mark.sphinx(
     "html",
     confoverrides={