diff --git a/tox.ini b/tox.ini
index 4d9c7df..24f9f4b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -31,11 +31,12 @@
           OS_STDOUT_CAPTURE
 
 [testenv:pep8]
-basepython = python2.7
+basepython = python3
 commands = sh tools/pretty_flake8.sh
 
 
 [testenv:docs]
+basepython = python3
 commands = rm -rf doc/build
            sphinx-build -E -W -b html doc/source doc/build/html
 
@@ -66,6 +67,7 @@
 commands=pip-missing-reqs -d --ignore-file=designate/tests/* designate
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [flake8]