diff --git a/docs/source/conf.py b/docs/source/conf.py
index 16761d0..29efa26 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -13,9 +13,6 @@
 # serve to show the default.
 
 import datetime
-import sys
-import os
-import shlex
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
diff --git a/src/brotlicffi/__init__.py b/src/brotlicffi/__init__.py
index abc82e5..e4b3ff1 100644
--- a/src/brotlicffi/__init__.py
+++ b/src/brotlicffi/__init__.py
@@ -1,6 +1,5 @@
 # -*- coding: utf-8 -*-
-# flake8: noqa
-from ._api import (
+from ._api import (  # noqa: F401
     decompress, Decompressor, compress, BrotliEncoderMode, DEFAULT_MODE,
     Compressor, MODE_GENERIC, MODE_TEXT, MODE_FONT, error, Error
 )
diff --git a/tox.ini b/tox.ini
index 8e4db44..2bfadd1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,5 +11,5 @@ commands= py.test {toxinidir}/test/
 
 [testenv:lint]
 basepython=python3
-deps = flake8
-commands = flake8 --max-complexity 10 src/brotlicffi test
+deps = ruff
+commands = ruff check --exclude=libbrotli --extend-select=C90