diff --git a/tox.ini b/tox.ini
index a16b80ed6..a4acdd159 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,7 +6,7 @@ envlist = py36
 passenv = LC_ALL, LANG, HOME
 deps =
     binaryornot
-    flake8==2.5.5
+    flake8==3.5.0
     pytest-cookies
     sh
 commands = py.test {posargs:tests}