diff --git a/setup.py b/setup.py
index a46d8794..eceff428 100644
--- a/setup.py
+++ b/setup.py
@@ -11,7 +11,12 @@ extras_require = {
         "pytest-cov>=2.7.1,<3.0.0",
         "pytest-asyncio>=0.10.0,<1.0.0",
     ],
-    "lint": ["mypy>=0.701,<1.0", "black==19.3b0", "isort==4.3.21"],
+    "lint": [
+        "mypy>=0.701,<1.0",
+        "black==19.3b0",
+        "isort==4.3.21",
+        "flake8>=3.7.7,<4.0.0",
+    ],
     "dev": ["tox>=3.13.2,<4.0.0"],
 }