diff --git a/.travis.yml b/.travis.yml
index a775163..64d9523 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,8 @@ matrix:
   fast_finish: true
 
   include:
+    - php: nightly
+
     - php: 7.2
       env: PREFER_LOWEST=1