diff --git a/.travis.yml b/.travis.yml
index 3ebf76cd..1023fe36 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,7 @@ cache:
   - vendor
 
 php:
+  - 5.5.9
   - 5.5
   - 5.6
   - 7.0
@@ -21,4 +22,4 @@ script:
 branches:
   only:
     - master
-    - V5-WIP
\ No newline at end of file
+    - V5-WIP