diff --git a/tox.ini b/tox.ini
index ac55994..65b5243 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-minversion = 3.2.1
+minversion = 3.9.0
 envlist = pep8
 skipsdist = True
 ignore_basepython_conflict=true
@@ -15,6 +15,10 @@
 commands = stestr run --slowest {posargs}
 
 [testenv:pep8]
+deps =
+    hacking>=3.1.0,<4.0.0 # Apache-2.0
+    flake8-import-order>=0.17.1 # LGPLv3
+    pycodestyle>=2.0.0,<2.7.0 # MIT
 commands = flake8 {posargs}
 
 [testenv:venv]
@@ -27,7 +31,7 @@
 commands =
     stestr run {posargs}
     coverage combine
-    coverage htlm -d cover
+    coverage html -d cover
     coverage xml -o cover/coverage.xml
 
 [testenv:docs]