diff --git a/nailgun/tox.ini b/nailgun/tox.ini
index 3f2e3f8a90..57f03605cd 100644
--- a/nailgun/tox.ini
+++ b/nailgun/tox.ini
@@ -5,7 +5,7 @@ envlist = py26,py27,pep8
 
 [testenv]
 usedevelop = True
-install_command = pip install -U {opts} {packages}
+install_command = pip install -c https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt?h=stable/mitaka {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/test-requirements.txt
 commands =
@@ -15,7 +15,7 @@ commands =
 downloadcache = ~/cache/pip
 
 [testenv:pep8]
-deps = hacking==0.10
+deps = hacking
 usedevelop = False
 commands =
     flake8 {posargs:nailgun}
diff --git a/tox.ini b/tox.ini
index 90e88d65d7..5f82aa32a0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,7 +6,7 @@ envlist = py26,py27,py34,pep8
 
 [testenv]
 usedevelop = True
-install_command = pip install --allow-external -U {opts} {packages}
+install_command = pip install -c https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt?h=stable/mitaka {opts} {packages}
 whitelist_externals = bash
                       python
 changedir={toxinidir}/nailgun
@@ -36,7 +36,7 @@ deps = -r{toxinidir}/nailgun/requirements.txt
 commands = {posargs:}
 
 [testenv:pep8]
-deps = hacking==0.10
+deps = hacking
 usedevelop = False
 commands =
     flake8 {posargs:nailgun}