diff --git a/monitoring-for-openstack/tox.ini b/monitoring-for-openstack/tox.ini
index e7d8105..df34b39 100644
--- a/monitoring-for-openstack/tox.ini
+++ b/monitoring-for-openstack/tox.ini
@@ -1,7 +1,7 @@
 [tox]
 minversion = 1.6
 skipsdist = True
-envlist = py34,py27,pep8
+envlist = py35,py27,pep8
 
 [testenv]
 usedevelop = True
@@ -12,6 +12,7 @@ install_command = pip install -U {opts} {packages}
 commands = python setup.py testr --slowest --testr-args="{posargs}"
 
 [testenv:bashate]
+basepython = python3
 deps = bashate
 whitelist_externals = bash
 commands = bash -c "find {toxinidir}             \
@@ -24,11 +25,13 @@ commands = bash -c "find {toxinidir}             \
          -print0 | xargs -0 bashate -v"
 
 [testenv:pep8]
+basepython = python3
 deps = {[testenv]deps}
        hacking>=0.9.2,<0.10
 commands = flake8
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [flake8]