diff --git a/.travis.yml b/.travis.yml
index 8e476f0..c4c516f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -40,6 +40,18 @@ after_success: coveralls
 
 matrix:
   exclude:
+  - python: 2.6
+    env: TOXENV='pep8'
+  - python: 2.6
+    env: TOXENV='isort'
+  - python: 2.7
+    env: TOXENV='pep8'
+  - python: 2.7
+    env: TOXENV='isort'
+  - python: 3.3
+    env: TOXENV='pep8'
+  - python: 3.3
+    env: TOXENV='isort'
   - python: 2.6
     env: DJANGO='django17' CMS='cms30'
   - python: 2.6