diff --git a/ndbioimage/__init__.py b/ndbioimage/__init__.py
index 1ca58c7..d8efcf6 100755
--- a/ndbioimage/__init__.py
+++ b/ndbioimage/__init__.py
@@ -132,7 +132,7 @@ class Shape(tuple):
         return tuple(self[i] for i in 'yxczt')  # type: ignore
 
 
-class CachedPath(Path):
+class CachedPath(type(Path())):
     """ helper class for checking whether a file has changed, used by OmeCache """
 
     def __init__(self, path: Path | str) -> None:
diff --git a/pyproject.toml b/pyproject.toml
index 23d7f6e..8f5251e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "ndbioimage"
-version = "2024.4.0"
+version = "2024.4.1"
 description = "Bio image reading, metadata and some affine registration."
 authors = ["W. Pomp <w.pomp@nki.nl>"]
 license = "GPLv3"