diff --git a/test-requirements.txt b/test-requirements.txt
index 076eeb9836..4b78b1de8d 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,7 +1,3 @@
-# Install bounded pep8/pyflakes first, then let flake8 install
-pep8==1.4.5
-pyflakes==0.7.2
-flake8==2.0
 hacking>=0.5.6,<0.7
 coverage>=3.6
 discover
diff --git a/tox.ini b/tox.ini
index 7866cc0bf0..64a93f1080 100644
--- a/tox.ini
+++ b/tox.ini
@@ -17,7 +17,7 @@ downloadcache = ~/cache/pip
 
 [testenv:pep8]
 commands =
-  flake8
+  flake8 {posargs}
 
 [testenv:cover]
 setenv = VIRTUAL_ENV={envdir}