diff --git a/bindings/python/pyproject.toml b/bindings/python/pyproject.toml
index 81f70af3d..1b3c8df42 100644
--- a/bindings/python/pyproject.toml
+++ b/bindings/python/pyproject.toml
@@ -34,7 +34,7 @@ Source = 'https://github.com/huggingface/tokenizers'
 
 
 [project.optional-dependencies]
-testing = ["pytest", "requests", "numpy", "datasets", "black==22.3"]
+testing = ["pytest", "requests", "numpy", "datasets", "black==22.3", "ruff"]
 docs = ["sphinx", "sphinx_rtd_theme", "setuptools_rust"]
 dev = ["tokenizers[testing]"]