diff --git a/tox.ini b/tox.ini
index c11c8ec..9a3675e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -23,11 +23,12 @@ deps = -r{toxinidir}/test-requirements.txt
 commands = /bin/true
 
 [testenv:pep8]
-basepython = python2.7
+basepython = python3
 deps = -r{toxinidir}/test-requirements.txt
 commands = flake8 {posargs}
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [flake8]