diff --git a/.travis.yml b/.travis.yml
index 320ee80..2eb1c4b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,11 @@ matrix:
       env: PLONE_VERSION=4.0
     - python: 2.6
       env: PLONE_VERSION=4.1
+  allow_failures:
+    - python: 2.6
+      env: PLONE_VERSION=4.0
+    - python: 2.7
+      env: PLONE_VERSION=4.2
 install:
   - sed -ie "s#travis-4.x.cfg#travis-$PLONE_VERSION.x.cfg#" travis.cfg
   - mkdir -p buildout-cache/downloads