diff --git a/tox.ini b/tox.ini
index 77a29d1f..59ab01b0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -126,7 +126,7 @@ skip_install = True
 deps =
     hacking
     flake8-bugbear
-    flake8
+    flake8 < 3.6.0
 commands =
     flake8