diff --git a/.travis.yml b/.travis.yml
index 19f8fb570..55978877a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,6 +15,7 @@ php:
     - 5.6
     - 7.0
     - 7.1
+    - nightly
     - hhvm
 
 env:
@@ -41,3 +42,5 @@ matrix:
           env: TWIG_EXT=yes
         - php: 7.1
           env: TWIG_EXT=yes
+        - php: nightly
+          env: TWIG_EXT=yes