diff --git a/setup.py b/setup.py
index 4948a135..84ea4f26 100644
--- a/setup.py
+++ b/setup.py
@@ -40,7 +40,7 @@ setuptools.setup(
     entry_points={"console_scripts": ["capa=capa.main:main",]},
     include_package_data=True,
     install_requires=requirements,
-    extras_require={"dev": ["pytest", "pytest-sugar", "pycodestyle",]},
+    extras_require={"dev": ["pytest", "pytest-sugar", "pycodestyle", "black", "isort"]},
     zip_safe=False,
     keywords="capa",
     classifiers=[