diff --git a/setup.py b/setup.py
index 11ad2fed..f57f7d07 100644
--- a/setup.py
+++ b/setup.py
@@ -54,7 +54,7 @@ setup(
             "pytest-asyncio==0.10.0",
             "aiohttp==3.5.3",
             "beautifulsoup4==4.6.1",
-            "black",
+            "black; python_version>'3.5'",
         ]
     },
     tests_require=["datasette[test]"],