diff --git a/test-requirements.txt b/test-requirements.txt
index e5fbed1f..0b506e5d 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -4,6 +4,8 @@ pytest
 pytest-xdist
 pytest-html
 six
+pep8
 pyserial
 future
 requests
+pywin32; platform_system=="Windows"
diff --git a/tox.ini b/tox.ini
index dc44ec8b..abc97cdd 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = unit,driver,style,py3clean,py3unit,py3driver
+envlist = style,py3unit,py3driver
 skipsdist = True
 
 [testenv]