diff --git a/setup.cfg b/setup.cfg
index 299e55b..8b9d03c 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -16,8 +16,7 @@ classifier =
     Programming Language :: Python :: 2
     Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.3
-    Programming Language :: Python :: 3.4
+    Programming Language :: Python :: 3.5
 
 [files]
 packages =
diff --git a/tox.ini b/tox.ini
index 7a07855..47e5801 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 2.0
-envlist = py34,py27,pypy,pep8
+envlist = py35,py27,pypy,pep8
 skipsdist = True
 
 [testenv]
@@ -15,19 +15,23 @@ deps = -r{toxinidir}/test-requirements.txt
 commands = stestr --test-path ./tempest_stress/tests run {posargs}
 
 [testenv:stress]
+basepython = python3
 envdir = .tox/tempest_stress
 sitepackages = False
 commands =
     run-tempest-stress {posargs}
 
 [testenv:pep8]
+basepython = python3
 sitepackages = False
 commands = flake8 {posargs}
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:cover]
+basepython = python3
 setenv =
     VIRTUAL_ENV={envdir}
     PYTHON=coverage run --source tempest_stress --parallel-mode
@@ -38,9 +42,11 @@ commands =
     coverage xml -o cover/coverage.xml
 
 [testenv:docs]
+basepython = python3
 commands = python setup.py build_sphinx
 
 [testenv:debug]
+basepython = python3
 commands = oslo_debug_helper {posargs}
 
 [flake8]