diff --git a/.travis.yml b/.travis.yml
index 37e57a5..bc47e02 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,10 +1,10 @@
 language: php
 php:
-- 5.4
 - 5.5
 - 5.6
 - 7.0
 - 7.1
+- hhvm
 install:
     - composer self-update
     - composer global require "fxp/composer-asset-plugin:*"
diff --git a/composer.json b/composer.json
index 66e0e8f..ed22316 100644
--- a/composer.json
+++ b/composer.json
@@ -16,6 +16,7 @@
         }
     ],
     "require": {
+        "php": ">=5.5.0",
         "yiisoft/yii2": "^2.0"
     },
     "autoload": {