diff --git a/tox.ini b/tox.ini
index f3b52ae4335..f211389b941 100644
--- a/tox.ini
+++ b/tox.ini
@@ -106,7 +106,7 @@ deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:pep8]
-basepython = python2.7
+basepython = python3
 deps =
   {[testenv]deps}
 commands=
@@ -126,7 +126,7 @@ whitelist_externals =
   bash
 
 [testenv:cover]
-basepython = python2.7
+basepython = python3
 setenv =
   {[testenv]setenv}
   PYTHON=coverage run --source neutron --parallel-mode