diff --git a/.travis.yml b/.travis.yml
index a2d1456..ca061a7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,6 +5,11 @@ php:
   - 5.5
   - 5.6
   - hhvm
+  - nightly
+
+matrix:
+  allow_failures:
+  - php: nightly
 
 before_script:
   - composer self-update