diff --git a/tools/pip-install-single-req.sh b/tools/pip-install-single-req.sh
new file mode 100755
index 000000000..b2ef4ffc7
--- /dev/null
+++ b/tools/pip-install-single-req.sh
@@ -0,0 +1,5 @@
+#!/bin/sh
+
+# install specific package $2 according to
+# version specified in requirements file $1
+pip install -U `grep $2 $1 | sed 's/#.*//'`
diff --git a/tox.ini b/tox.ini
index a4d2624b2..4583911ac 100644
--- a/tox.ini
+++ b/tox.ini
@@ -20,7 +20,10 @@ commands =
  python setup.py testr --slowest --testr-args='{posargs}'
 
 [testenv:pep8]
-commands = flake8
+usedevelop = False
+deps =
+commands = {toxinidir}/tools/pip-install-single-req.sh test-requirements.txt hacking
+           flake8
 
 [testenv:venv]
 commands = {posargs}
@@ -44,4 +47,7 @@ builtins = _
 exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build,*thirdparty/*,CongressLexer.py,CongressParser.py,contrib/*
 
 [testenv:genconfig]
-commands = oslo-config-generator --config-file=etc/congress-config-generator.conf
+usedevelop = False
+deps =
+commands = {toxinidir}/tools/pip-install-single-req.sh requirements.txt oslo.config
+           oslo-config-generator --config-file=etc/congress-config-generator.conf