diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index ab0c4d3..abeb3f7 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -39,6 +39,4 @@ jobs:
       - name: Launch tests
         run: python -m pytest -n auto
       - name: Check coding style
-        run: python -m flake8
-      - name: Check imports order
-        run: python -m isort . --check --diff
+        run: python -m ruff check
diff --git a/flask_weasyprint/__init__.py b/flask_weasyprint/__init__.py
index 2851f73..9bb248a 100644
--- a/flask_weasyprint/__init__.py
+++ b/flask_weasyprint/__init__.py
@@ -146,7 +146,7 @@ def _wrapper(class_, *args, **kwargs):
     return class_(guess, *args, **kwargs)
 
 
-def HTML(*args, **kwargs):
+def HTML(*args, **kwargs):  # noqa: N802
     """Like :class:`weasyprint.HTML` but:
 
     * :func:`make_url_fetcher` is used to create an ``url_fetcher``
@@ -163,7 +163,7 @@ def HTML(*args, **kwargs):
     return _wrapper(HTML, *args, **kwargs)
 
 
-def CSS(*args, **kwargs):
+def CSS(*args, **kwargs):  # noqa: N802
     from weasyprint import CSS  # lazy loading
     return _wrapper(CSS, *args, **kwargs)
 
diff --git a/pyproject.toml b/pyproject.toml
index 17a4886..d208a7b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -46,7 +46,7 @@ Donation = 'https://opencollective.com/courtbouillon'
 
 [project.optional-dependencies]
 doc = ['sphinx', 'sphinx_rtd_theme']
-test = ['pytest', 'isort', 'flake8']
+test = ['pytest', 'ruff']
 
 [tool.flit.sdist]
 exclude = ['.*']
@@ -59,6 +59,6 @@ include = ['tests/*', 'flask_weasyprint/*']
 exclude_lines = ['pragma: no cover', 'def __repr__', 'raise NotImplementedError']
 omit = ['.*']
 
-[tool.isort]
-default_section = 'FIRSTPARTY'
-multi_line_output = 4
+[tool.ruff.lint]
+select = ['E', 'W', 'F', 'I', 'N', 'RUF']
+ignore = ['RUF001', 'RUF002', 'RUF003']
diff --git a/tests/__init__.py b/tests/__init__.py
index 2999b96..9d05f57 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -14,7 +14,7 @@
 
 @app.config.from_object
 class Config:
-    GRAPH_COLORS = ['#0C3795', '#752641', '#E47F00']
+    GRAPH_COLORS = ('#0C3795', '#752641', '#E47F00')
 
 
 @app.route('/')
diff --git a/tests/test_flask_weasyprint.py b/tests/test_flask_weasyprint.py
index d9afdf7..d8a5a43 100644
--- a/tests/test_flask_weasyprint.py
+++ b/tests/test_flask_weasyprint.py
@@ -2,10 +2,11 @@
 
 import pytest
 from flask import Flask, json, jsonify, redirect, request
-from flask_weasyprint import CSS, HTML, make_url_fetcher, render_pdf
 from weasyprint import __version__ as weasyprint_version
 from werkzeug.test import ClientRedirectError
 
+from flask_weasyprint import CSS, HTML, make_url_fetcher, render_pdf
+
 from . import app, document_html