diff --git a/composer.json b/composer.json
index 65446b3443d6519a8d72d36d8fabf47629123f15..bd7acaa287e6d0977e4d90f80668e15021e18815 100644
--- a/composer.json
+++ b/composer.json
@@ -9,6 +9,7 @@
     ],
     "license": "GPL-2.0",
     "require": {
+        "php": ">=5.6",
         "aferrandini/phpqrcode": "1.0.1",
         "jasig/phpcas": "1.3.4",
         "cap60552/php-sip2": "1.0.0",