diff --git a/composer.json b/composer.json
index 548cffd..74645c9 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,9 @@
 {
     "name": "anwinged/reason",
     "type": "library",
-    "require": {},
+    "require": {
+        "php": "^7.0"
+    },
     "require-dev": {
         "phpunit/phpunit": "^6.0"
     },