diff --git a/.travis.yml b/.travis.yml
index f30edda..22a95c2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,11 @@
 language: php
 php:
-  - 5.5
   - 5.6
   - 7.0
   - nightly
 
-before_script: composer install
+before_script:
+  - travis_retry composer self-update
+  - travis_retry composer install --prefer-dist --no-interaction
+
+script: phpunit