1 files changed, 1 insertions, 0 deletions

diff --git a/.travis.yml b/.travis.yml
index c970363cd..a00611bac 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,7 @@ sudo: required
 dist: trusty
 language: php
 php:
+    - 5.5
     - 5.6
     - 7
 env: