diff --git a/tox.ini b/tox.ini
index 575bfdf8..c4435e78 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,7 +9,7 @@ commands=
     unit2 discover tests []
 
 [testenv:coveralls]
-basepython=python2.7
+basepython=python3.5
 passenv=TRAVIS TRAVIS_JOB_ID TRAVIS_BRANCH
 deps=
     {[testenv]deps}