diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
index dd4d67ad..e119297a 100644
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -180,10 +180,11 @@ This is only possible if you're a maintainer.
 4. Update the ``release`` variable in ``docs/conf.py`` with the new version number.
 5. Update the ``__version__`` variable in ``src/grimp/__init__.py`` with the new version number.
 6. Update ``project.version`` in ``pyproject.toml`` with the new version number.
-7. ``git commit -am "Release v{new version number"``
-8. ``git push``
-9. Wait for tests to pass on CI.
-10. ``git tag v{new version number}``
-11. ``git push --tags``
-12. This should kick start the Github ``release`` workflow, which builds wheels and releases the
+7. ``uv lock`` to sync ``uv.lock`` with the new version.
+8. ``git commit -am "Release v{new version number"``
+9. ``git push``
+10. Wait for tests to pass on CI.
+11. ``git tag v{new version number}``
+12. ``git push --tags``
+13. This should kick start the Github ``release`` workflow, which builds wheels and releases the
     project to PyPI.
diff --git a/justfile b/justfile
index ea2930a4..b0478035 100644
--- a/justfile
+++ b/justfile
@@ -71,6 +71,8 @@ format:
 # Lint Python code.
 [group('linting')]
 lint-python:
+    @echo 'Checking uv.lock is up to date...'
+    @uv lock --check
     @echo 'Running ruff format...'
     @uv run ruff format --check
     @echo 'Running ruff check...'