diff --git a/composer.json b/composer.json
index 224d966b..551e9d7d 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
     "name": "brianium/paratest",
     "require": {
-        "php": ">=5.4.0",
+        "php": ">=5.5.11",
         "phpunit/phpunit": ">=3.7.8",
         "phpunit/php-timer": ">=1.0.4",
         "symfony/console": "~2.3|~3.0",