diff --git a/.travis.yml b/.travis.yml
index 8156c49..61f9076 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,11 @@ language: php
 php:
   - 5.6
   - 7.0
+  - nightly
+
+matrix:
+  allow_failures:
+    - php: nightly
 
 before_script:
   - "mkdir -p ~/.composer"