diff --git a/tox.ini b/tox.ini
index 1f5b246b..837f50b0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,12 +3,13 @@ envlist = py35,pep8,bandit
 
 [testenv]
 setenv = YAMLDIR = {toxinidir}/tests/yaml_samples/
-basepython=python3.5
+basepython=python3
 deps=
   -rrequirements-lock.txt
   -rrequirements-test.txt
 
 [testenv:freeze]
+basepython=python3
 whitelist_externals=
   rm
   sh
@@ -19,6 +20,7 @@ commands=
   sh -c "pip freeze --all | grep -v 'drydock-provisioner|pyinotify|pkg-resources==0.0.0' > requirements-lock.txt"
 
 [testenv:yapf]
+basepython=python3
 whitelist_externals=find
 commands=
   yapf -i -r  --style=pep8 {toxinidir}/setup.py
@@ -28,6 +30,7 @@ commands=
   find {toxinidir}/drydock_provisioner -name '__init__.py' -exec yapf -i --style=pep8 \{\} ;
 
 [testenv:py35]
+basepython=python3
 usedevelop=True
 setenv=
   PYTHONWARNING=all
@@ -38,6 +41,7 @@ commands=
     {toxinidir}/tests/unit/{posargs}
 
 [testenv:integration]
+basepython=python3.5
 passenv=DOCKER_REGISTRY IMAGE_NAME IMAGE_PREFIX IMAGE_TAG
 setenv=
   PYTHONWARNING=all
@@ -48,6 +52,7 @@ commands=
     {toxinidir}/tests/integration/postgres/{posargs}
 
 [testenv:cover]
+basepython=python3
 usedevelop=True
 passenv=DOCKER_REGISTRY IMAGE_NAME IMAGE_PREFIX IMAGE_TAG
 setenv=
@@ -58,20 +63,24 @@ commands=
     {toxinidir}/tests/unit/ {toxinidir}/tests/integration/postgres
 
 [testenv:genconfig]
+basepython=python3
 whitelist_externals=tee
                     sh
 commands = sh -c 'oslo-config-generator --config-file=etc/drydock/drydock-config-generator.conf | tee etc/drydock/drydock.conf.sample docs/source/_static/drydock.conf.sample'
 
 [testenv:genpolicy]
+basepython=python3
 whitelist_externals=tee
                     sh
 commands = sh -c 'oslopolicy-sample-generator --config-file etc/drydock/drydock-policy-generator.conf | tee etc/drydock/policy.yaml.sample docs/source/_static/policy.yaml.sample'
 
 [testenv:pep8]
+basepython=python3
 commands = flake8 \
              {posargs}
 
 [testenv:bandit]
+basepython=python3
 commands = bandit -r drydock_provisioner -n 5
 
 [flake8]
@@ -80,6 +89,7 @@ exclude= venv,.venv,.git,.idea,.tox,*.egg-info,*.eggs,bin,dist,./build/,alembic/
 max-line-length=119
 
 [testenv:docs]
+basepython=python3
 deps=
   -rdocs/requirements-doc.txt
 whitelist_externals=rm