diff --git a/composer.json b/composer.json
index 7af865f8912b..1f0b868f4d03 100644
--- a/composer.json
+++ b/composer.json
@@ -13,6 +13,10 @@
         }
     ],
     "require": {
+        "php": ">=5.5.9",
+        "ext-mcrypt": "*",
+        "ext-gmp": "*",
+        "ext-gd": "*",
         "turbo124/laravel-push-notification": "dev-laravel5",
         "omnipay/mollie": "dev-master#22956c1a62a9662afa5f5d119723b413770ac525",
         "omnipay/2checkout": "dev-master#e9c079c2dde0d7ba461903b3b7bd5caf6dee1248",