diff --git a/pyproject.toml b/pyproject.toml
index a3dbea1..1b35388 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,7 +38,7 @@ Donation = 'https://opencollective.com/courtbouillon'
 
 [project.optional-dependencies]
 doc = ['sphinx', 'sphinx_rtd_theme']
-test = ['pytest', 'isort', 'flake8', 'pillow']
+test = ['pytest', 'pillow']
 
 [tool.flit.sdist]
 exclude = ['.*']