diff --git a/.travis.yml b/.travis.yml
index e476eac1..5967e796 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,7 @@ php:
   - 5.6
   - 7.0
   - 7.1
+  - nightly
   - hhvm
 
 services: