diff --git a/pyproject.toml b/pyproject.toml
index 6050fbb..8981947 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,13 +41,13 @@ Donation = 'https://opencollective.com/courtbouillon'
 
 [project.optional-dependencies]
 doc = ['sphinx', 'sphinx_rtd_theme']
-test = ['pytest', 'pytest-cov', 'pytest-flake8', 'pytest-isort', 'coverage[toml]']
+test = ['pytest', 'pytest-cov', 'coverage[toml]']
 
 [tool.flit.sdist]
 exclude = ['.*']
 
 [tool.pytest.ini_options]
-addopts = '--isort --flake8 --cov --no-cov-on-fail'
+addopts = '--cov --no-cov-on-fail'
 norecursedirs = ['tests/css-parsing-tests']
 
 [tool.coverage.run]