diff --git a/.github/workflows/ci-tests.yml b/.github/workflows/ci-tests.yml
index a30842a2..5e8baa09 100644
--- a/.github/workflows/ci-tests.yml
+++ b/.github/workflows/ci-tests.yml
@@ -20,12 +20,13 @@ on:
 
 jobs:
   tests:
-    name: "Test Python ${{ matrix.version }} session= ${{ matrix.session }}"
+    name: "Test session=${{ matrix.session }}  Python=${{ matrix.python-version }}"
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
         session: ["tests", "doctests-docs", "doctests-api"]
+        python-version: ["3.12", "3.13"]
     defaults:
       run:
         shell: bash -l {0}
@@ -42,7 +43,7 @@ jobs:
         with:
           miniforge-version: latest
           activate-environment: testenv
-          python-version: ${{ matrix.version }}
+          python-version: ${{ matrix.python-version }}
           channels: conda-forge
           show-channel-urls: true
 
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 95e97799..f109aaac 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -33,7 +33,7 @@ repos:
         types_or: [asciidoc, python, markdown, rst]
         additional_dependencies: [tomli]
 
--   repo: https://github.com/psf/black
+-   repo: https://github.com/psf/black-pre-commit-mirror
     rev: 25.9.0
     hooks:
     -   id: black
@@ -47,7 +47,7 @@ repos:
         types: [file, python]
 
 -   repo: https://github.com/pycqa/isort
-    rev: 6.0.1
+    rev: 7.0.0
     hooks:
     -   id: isort
         types: [file, python]
diff --git a/pyproject.toml b/pyproject.toml
index a281d959..0c6ad77b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,7 +14,7 @@ authors = [
     {name = "Patrick Peglar", email = "patrick.peglar@metoffice.gov.uk"},
 ]
 description = "Abstract NetCDF data objects, providing fast data transfer between analysis packages."
-requires-python = ">=3.7"
+requires-python = ">=3.7, <3.14"
 keywords = [
     "cf-metadata",
     "data-analysis",
@@ -39,6 +39,7 @@ classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Topic :: Scientific/Engineering",
 ]
 dynamic = [
diff --git a/requirements/readthedocs.yml b/requirements/readthedocs.yml
index 8c6e5125..b7c80df8 100644
--- a/requirements/readthedocs.yml
+++ b/requirements/readthedocs.yml
@@ -12,7 +12,7 @@ dependencies:
   - pip
   - pydata-sphinx-theme
   - pytest
-  - python<3.13
+  - python<3.14
   - sphinx
   - sphinxcontrib-napoleon
   - sphinx-copybutton
diff --git a/tests/integration/test_xarray_load_and_save_equivalence.py b/tests/integration/test_xarray_load_and_save_equivalence.py
index a9148133..fce40538 100644
--- a/tests/integration/test_xarray_load_and_save_equivalence.py
+++ b/tests/integration/test_xarray_load_and_save_equivalence.py
@@ -68,7 +68,7 @@ def test_save_direct_vs_viancdata(standard_testcase, tmp_path):
 
     # Re-save from Xarray
     temp_direct_savepath = tmp_path / "temp_save_xarray.nc"
-    xrds.to_netcdf(temp_direct_savepath)
+    xrds.to_netcdf(temp_direct_savepath, engine="netcdf4")
     # Save same, via ncdata
     temp_ncdata_savepath = tmp_path / "temp_save_xarray_via_ncdata.nc"
     ncds_fromxr = from_xarray(xrds)