diff --git a/.travis.yml b/.travis.yml
index 4d0c97b..7da5f3b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,9 @@
 language: php
 php:
-  - '5.5'
-  - '5.6'
-  - '7.0'
+  - 5.5
+  - 5.6
+  - 7.0
+  - 7.1
 install:
   - composer install
 before_script: