diff --git a/.travis.yml b/.travis.yml
index 579696e..6f4f0f1 100755
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,7 @@ php:
   - 7.0
   - 7.1
   - hhvm
+  - nightly
 
 matrix:
   allow_failures: