diff --git a/.travis.yml b/.travis.yml
index dc191a2..5922d0e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,12 @@
 language: php
 php:
   - 5.4
+  - 5.5
+  - 5.6
+  - 7.1
+  - 7.2
+  - 7.3
+  - 7.4
 
 before_script:
   - composer install --prefer-dist