diff --git a/composer.json b/composer.json
index 151bbba..c1f478b 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
         "sort-packages": true
     },
     "require": {
-        "php": ">=5.3",
+        "php": "^5.5 || ^7.0",
         "ext-curl": "*",
         "padraic/phar-updater": "^1.0",
         "psr/log": "^1.0",