diff --git a/conftest.py b/conftest.py
index f6bc76e..45bfff1 100644
--- a/conftest.py
+++ b/conftest.py
@@ -1,8 +1,13 @@
-import os
+"""Pytest collection config: keep the scratch package (taped/scrap) out of collection.
+
+Uses the pytest>=7 ``collection_path``/``config`` hook signature — the legacy
+one-argument ``pytest_ignore_collect(path)`` form was removed in pytest 9 and
+made every CI run fail with a PluginValidationError before any test ran.
+"""
 import pathlib
 
 
-def pytest_ignore_collect(path):
+def pytest_ignore_collect(collection_path: pathlib.Path, config) -> bool:
     root_dir = pathlib.Path(__file__).parent.resolve()
-    scrap_dir = pathlib.PurePath(root_dir, "taped", "scrap")
-    return str(scrap_dir) in str(path)
+    scrap_dir = root_dir / "taped" / "scrap"
+    return scrap_dir == collection_path or scrap_dir in collection_path.parents