diff --git a/pyproject.toml b/pyproject.toml
index 41535ed..30dbcd4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -32,7 +32,7 @@ classifiers = [
 
 [tool.flit.metadata.requires-extra]
 doc = ['sphinx', 'sphinx_rtd_theme']
-test = ['pytest', 'pytest-cov', 'pytest-flake8', 'pytest-isort', 'coverage[toml]']
+test = ['pytest', 'pytest-cov', 'coverage[toml]']
 
 [tool.flit.metadata.urls]
 Documentation = 'https://tinycss2.readthedocs.io/'
@@ -44,7 +44,7 @@ Donation = 'https://opencollective.com/courtbouillon'
 exclude = ['.*']
 
 [tool.pytest.ini_options]
-addopts = '--isort --flake8 --cov'
+addopts = '--cov'
 norecursedirs = ['tests/css-parsing-tests']
 
 [tool.coverage.run]
diff --git a/setup.py b/setup.py
index 8e8a09c..8901670 100644
--- a/setup.py
+++ b/setup.py
@@ -16,8 +16,6 @@ extras_require = \
 {'doc': ['sphinx', 'sphinx_rtd_theme'],
  'test': ['pytest',
           'pytest-cov',
-          'pytest-flake8',
-          'pytest-isort',
           'coverage[toml]']}
 
 setup(name='tinycss2',