diff --git a/.travis.yml b/.travis.yml
index 60cc19d..0bfdd18 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -25,6 +25,7 @@ matrix:
       env: COMPOSER_FLAGS="--prefer-lowest"
     - php: 7.4
       env: COMPOSER_FLAGS="--prefer-lowest"
+    - php: nightly
 
 before_install:
   - composer self-update