diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 1cd7461f..d2b600e0 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -27,7 +27,7 @@ jobs:
       fail-fast: false
       matrix:
         os: ["ubuntu-latest"]
-        python-version: ["3.9", "3.12"]
+        python-version: ["3.10", "3.12"]
     steps:
       - uses: actions/checkout@v4
         with:
@@ -91,7 +91,7 @@ jobs:
         shell: bash -l {0}
     strategy:
       matrix:
-        python-version: ["3.9", "3.12"]
+        python-version: ["3.10", "3.12"]
     steps:
       - uses: actions/checkout@v4
         with:
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 1a52d50f..335204fd 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -3,25 +3,25 @@ ci:
 
 repos:
   - repo: https://github.com/asottile/pyupgrade
-    rev: v3.16.0
+    rev: v3.17.0
     hooks:
       - id: pyupgrade
-        args: ["--py39-plus"]
+        args: ["--py310-plus"]
 
   - repo: https://github.com/astral-sh/ruff-pre-commit
     # Ruff version.
-    rev: 'v0.5.0'
+    rev: 'v0.6.1'
     hooks:
       - id: ruff
         args: ["--show-fixes", "--fix"]
 
   - repo: https://github.com/psf/black-pre-commit-mirror
-    rev: 24.4.2
+    rev: 24.8.0
     hooks:
       - id: black
 
   - repo: https://github.com/rstcheck/rstcheck
-    rev: v6.2.0
+    rev: v6.2.4
     hooks:
         - id: rstcheck
           additional_dependencies: [sphinx, tomli]
@@ -36,7 +36,7 @@ repos:
         - mdformat-myst
 
   - repo: https://github.com/nbQA-dev/nbQA
-    rev: 1.8.5
+    rev: 1.8.7
     hooks:
         - id: nbqa-black
         - id: nbqa-ruff
@@ -67,7 +67,7 @@ repos:
     - id: validate-cff
 
   - repo: https://github.com/abravalheri/validate-pyproject
-    rev: v0.18
+    rev: v0.19
     hooks:
       - id: validate-pyproject
 
diff --git a/.readthedocs.yml b/.readthedocs.yml
index c2cb5520..2d66a4bd 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -1,15 +1,16 @@
 version: 2
 
 build:
-  os: ubuntu-22.04
+  os: ubuntu-lts-latest
   tools:
-    python: mambaforge-4.10
+    python: mambaforge-latest
   jobs:
     post_checkout:
       - (git --no-pager log --pretty="tformat:%s" -1 | grep -vqF "[skip-rtd]") || exit 183
     pre_install:
       - conda list sphinx
       - conda list cf_xarray
+      - conda list
 
 conda:
   environment: ci/doc.yml
diff --git a/cf_xarray/accessor.py b/cf_xarray/accessor.py
index a915335b..0aa4ceef 100644
--- a/cf_xarray/accessor.py
+++ b/cf_xarray/accessor.py
@@ -5,11 +5,17 @@
 import itertools
 import re
 from collections import ChainMap, namedtuple
-from collections.abc import Hashable, Iterable, Mapping, MutableMapping, Sequence
+from collections.abc import (
+    Callable,
+    Hashable,
+    Iterable,
+    Mapping,
+    MutableMapping,
+    Sequence,
+)
 from datetime import datetime
 from typing import (
     Any,
-    Callable,
     Literal,
     TypeVar,
     Union,
diff --git a/cf_xarray/tests/test_accessor.py b/cf_xarray/tests/test_accessor.py
index 5cc58688..596897d7 100644
--- a/cf_xarray/tests/test_accessor.py
+++ b/cf_xarray/tests/test_accessor.py
@@ -57,6 +57,8 @@
 dataarrays = [airds.air, airds.air.chunk({"lat": 5})]
 objects = datasets + dataarrays
 
+xr.set_options(use_flox=False)
+
 
 def assert_dicts_identical(dict1, dict2):
     assert dict1.keys() == dict2.keys()
@@ -1125,7 +1127,7 @@ def _check_attrs_equal(o, n):
             else:
                 assert v == n[k]
 
-    assert type(old) == type(new)
+    assert type(old) == type(new)  # noqa
     _check_attrs_equal(old.attrs, new.attrs)
 
     # Check coordinate attributes and data variable attributes
diff --git a/ci/doc.yml b/ci/doc.yml
index 361c02d2..22640931 100644
--- a/ci/doc.yml
+++ b/ci/doc.yml
@@ -3,7 +3,7 @@ channels:
   - conda-forge
 dependencies:
   - pip
-  - python=3.10
+  - python
   - matplotlib-base
   - netcdf4
   - pooch
@@ -20,7 +20,7 @@ dependencies:
   - pint
   - regex
   - shapely
-  - furo
+  - furo>=2024
   - myst-nb
   - pip:
       - -e ../
diff --git a/pyproject.toml b/pyproject.toml
index 8eccfc66..f97edc00 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,7 +2,7 @@
 name = "cf_xarray"
 description = "A convenience wrapper for using CF attributes on xarray objects"
 readme = "README.rst"
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 license = {file = "LICENSE"}
 keywords = ["xarray", "metadata", "CF conventions"]
 classifiers = [
@@ -11,7 +11,6 @@ classifiers = [
     "Natural Language :: English",
     "Operating System :: OS Independent",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",