diff --git a/.travis.yml b/.travis.yml
index 8e562aaa..786382ac 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,14 +1,13 @@
+sudo: false
+dist: trusty
+
 language: php
 
 php:
-  - 5.4
-  - 5.5
   - 5.6
   - 7.0
   - hhvm
 
-sudo: false
-
 env:
   - COMPOSER_OPTS=""
   - COMPOSER_OPTS="--prefer-lowest"
diff --git a/composer.json b/composer.json
index f4cf0055..c5a99db6 100644
--- a/composer.json
+++ b/composer.json
@@ -7,7 +7,7 @@
     "license": "MIT",
 
     "require": {
-        "php": "~5.4|~7.0",
+        "php": "^5.6 || ^7.0",
         "bernard/normalt": "~1.0",
         "symfony/event-dispatcher": "~2.3|~3.0",
         "beberlei/assert": "~2.1"