diff --git a/.travis.yml b/.travis.yml
index fa88ccb..d17ec17 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,14 +1,13 @@
 language: php
 
 php:
-  - 5.5
   - 5.6
   - 7.0
   - 7.1
 
 before_script:
   - wget http://getcomposer.org/composer.phar
-  - php composer.phar install --dev
+  - php composer.phar install
 
 script:
   - vendor/bin/atoum