diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 170cc5e..eb59c76 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -25,7 +25,7 @@ repos:
         language: system
         pass_filenames: false
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.15.16
+    rev: v0.15.17
     hooks:
       - id: ruff
         args: ["--fix"]
diff --git a/pyproject.toml b/pyproject.toml
index b1cc006..1c0c0d9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,10 +20,7 @@ classifiers = [
     "Typing :: Typed",
 ]
 dynamic = ["version"]
-dependencies = [
-    "numpy>=1.24",
-    "zarr>=3.1",
-]
+dependencies = ["numpy>=1.24", "zarr>=3.1"]
 
 [dependency-groups]
 test = [
@@ -31,7 +28,7 @@ test = [
     "fsspec>2024",
     "numcodecs>=0.16.1",
     "obstore>=0.8.2",
-    "pytest",
+    "pytest!=9.1.0",     # https://github.com/pytest-dev/pytest/issues/14591
     "pytest-asyncio",
     "pytest-xdist",
     "pytest-mock",
@@ -41,8 +38,8 @@ dev = [
     "maturin",
     "pip",
     "pre-commit",
-    {include-group = "test"},
-    {include-group = "doc"},
+    { include-group = "test" },
+    { include-group = "doc" },
 ]
 
 [project.entry-points."zarr.codec_pipeline"]
diff --git a/tests/conftest.py b/tests/conftest.py
index e78149c..33cb129 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -11,6 +11,7 @@
 
 if TYPE_CHECKING:
     from collections.abc import Iterable
+    from pathlib import Path
     from typing import Any, Literal
 
     from zarr.abc.store import Store
@@ -31,7 +32,7 @@ def _setup_codec_pipeline():
 
 
 async def parse_store(
-    store: Literal["local", "memory", "remote", "zip"], path: str
+    store: Literal["local", "memory", "remote", "zip"], path: Path
 ) -> LocalStore | MemoryStore | FsspecStore | ZipStore:
     if store == "local":
         return await LocalStore.open(path)
@@ -40,14 +41,14 @@ async def parse_store(
     if store == "remote":
         return await FsspecStore.open(url=path)
     if store == "zip":
-        return await ZipStore.open(path + "/zarr.zip")
+        return await ZipStore.open(path / "zarr.zip")
     raise AssertionError
 
 
 @pytest.fixture(params=["local"])
-async def store(request: pytest.FixtureRequest, tmpdir) -> Store:
+async def store(request: pytest.FixtureRequest, tmp_path: Path) -> Store:
     param = request.param
-    return await parse_store(param, str(tmpdir))
+    return await parse_store(param, tmp_path)
 
 
 @pytest.fixture