diff --git a/setup.py b/setup.py
index 7d017fba9a..8f06e4c588 100644
--- a/setup.py
+++ b/setup.py
@@ -57,7 +57,7 @@
             "sphinx",
             "sphinx_rtd_theme",
             "recommonmark",
-            "black",
+            "black==19.10b0",
             "jsbeautifier",
             "twine",
         ],