diff --git a/.travis.yml b/.travis.yml
index cab00f9..3e1c640 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,15 @@
 language: php
 
 php:
+  - 5.3
+  - 5.4
+  - 5.5
+  - 5.6
   - 7.1
   - 7.2
   - 7.3
+  - 7.4
+  - nightly
 
 matrix:
   allow_failures: