diff --git a/tox.ini b/tox.ini
index 501e63f..93a1d09 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,59 +1,34 @@
 [tox]
 minversion = 2.0
-envlist = py35-constraints,py34-constraints,py27-constraints,pypy-constraints,pep8-constraints
+envlist = py35,py34,py27,pypy,pep8
 skipsdist = True
 
 [testenv]
 usedevelop = True
-install_command =
-                  constraints: {[testenv:common-constraints]install_command}
-                  pip install -U {opts} {packages}
+install_command = pip install -U {opts} {packages}
 setenv =
    VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/test-requirements.txt
 commands = python setup.py test --slowest --testr-args='{posargs}'
 
-[testenv:common-constraints]
-install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
-
 [testenv:py27-functional]
 commands = {toxinidir}/tools/kube-init.sh python setup.py testr --slowest --testr-args="{posargs}"
 
 [testenv:pep8]
 commands = flake8 {posargs}
 
-[testenv:pep8-constraints]
-install_command = {[testenv:common-constraints]install_command}
-commands = flake8 {posargs}
-
 [testenv:venv]
 commands = {posargs}
 
-[testenv:venv-constraints]
-install_command = {[testenv:common-constraints]install_command}
-commands = {posargs}
-
 [testenv:cover]
 commands = python setup.py test --coverage --testr-args='{posargs}'
 
-[testenv:cover-constraints]
-install_command = {[testenv:common-constraints]install_command}
-commands = python setup.py test --coverage --testr-args='{posargs}'
-
 [testenv:docs]
 commands = python setup.py build_sphinx
 
-[testenv:docs-constraints]
-install_command = {[testenv:common-constraints]install_command}
-commands = python setup.py build_sphinx
-
 [testenv:debug]
 commands = oslo_debug_helper {posargs}
 
-[testenv:debug-constraints]
-install_command = {[testenv:common-constraints]install_command}
-commands = oslo_debug_helper {posargs}
-
 [flake8]
 # E123, E125 skipped as they are invalid PEP-8.