diff --git a/.travis.yml b/.travis.yml
index 64a9859..565f95c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,8 @@
 
 language: python
 python:
+  - 3.3
+  - 3.4
   - 3.5
   
 # command to install dependencies, e.g. pip install -r requirements.txt --use-mirrors
diff --git a/tox.ini b/tox.ini
index 387386a..1e834ac 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,8 +1,10 @@
 [tox]
-envlist = py35, flake8
+envlist = py33, py34, py35, flake8
 
 [travis]
 python =
+    3.3: py33
+    3.4: py34
     3.5: py35
 
 [testenv:flake8]