diff --git a/tox.ini b/tox.ini
index e23dbc8..558e6f8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -20,7 +20,7 @@ deps =
 commands = stestr run {posargs}
 
 [testenv:pep8]
-deps = hacking>=3.0,<3.1.0
+deps = hacking>=6.1.0,<6.2.0
 commands = flake8 {posargs}
 
 [testenv:venv]