diff --git a/tox.ini b/tox.ini
index e00f9bbca..147d74531 100644
--- a/tox.ini
+++ b/tox.ini
@@ -106,7 +106,7 @@ skip_install = True
 deps =
     hacking
     flake8-bugbear
-    flake8
+    flake8<3.6.0
 commands =
     flake8