diff --git a/tox.ini b/tox.ini
index ad8835c46..b85964a12 100644
--- a/tox.ini
+++ b/tox.ini
@@ -107,7 +107,7 @@ commands= py.test -rfsxX {posargs}
 
 [testenv:regen]
 changedir=doc/en
-basepython = python3.4
+basepython = python3.5
 deps=sphinx
      PyYAML
      regendoc>=0.6.1