diff --git a/tox.ini b/tox.ini
index 40c2a45..5aaa148 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,6 +7,13 @@ envlist =
     doc
 skipsdist = true
 
+[travis]
+python =
+    2.7: py27-unit, py27-lint, format-check, bats
+    3.4: py34-unit, py34-lint, format-check, bats
+    3.5: py35-unit, py35-lint, format-check, bats
+    3.6: py36-unit, py36-lint, format-check, bats
+
 [testenv]
 passenv = *
 setenv = COVERAGE_FILE={toxworkdir}/.coverage