diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 6506f7349d..6068d0003d 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -7,7 +7,7 @@ default_language_version:
   python: python3
 repos:
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.8.0
+    rev: v0.8.1
     hooks:
     - id: ruff
       args: ["--fix", "--show-fixes"]
diff --git a/pyproject.toml b/pyproject.toml
index 63ecdd85be..c4c3a7a4e2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -294,11 +294,7 @@ extend-select = [
     "W",    # pycodestyle warnings
 ]
 ignore = [
-    "ANN101", # deprecated
-    "ANN102", # deprecated
     "ANN401",
-    "PT004",  # deprecated
-    "PT005",  # deprecated
     "PT011",  # TODO: apply this rule
     "PT012",  # TODO: apply this rule
     "RET505",
@@ -306,7 +302,6 @@ ignore = [
     "RUF005",
     "SIM108",
     "TRY003",
-    "UP027",  # deprecated
     "UP038",  # https://github.com/astral-sh/ruff/issues/7871
     # https://docs.astral.sh/ruff/formatter/#conflicting-lint-rules
     "W191",
diff --git a/src/zarr/core/group.py b/src/zarr/core/group.py
index 13a8c7209a..2ca6e209fd 100644
--- a/src/zarr/core/group.py
+++ b/src/zarr/core/group.py
@@ -434,7 +434,7 @@ async def from_store(
     async def open(
         cls,
         store: StoreLike,
-        zarr_format: Literal[2, 3, None] = 3,
+        zarr_format: Literal[2, 3] | None = 3,
         use_consolidated: bool | str | None = None,
     ) -> AsyncGroup:
         """Open a new AsyncGroup
@@ -1691,7 +1691,7 @@ def from_store(
     def open(
         cls,
         store: StoreLike,
-        zarr_format: Literal[2, 3, None] = 3,
+        zarr_format: Literal[2, 3] | None = 3,
     ) -> Group:
         """Open a group from an initialized store.