diff --git a/composer.json b/composer.json
index b923abc..9936794 100644
--- a/composer.json
+++ b/composer.json
@@ -25,7 +25,7 @@
         "source": "https://github.com/ramsey/uuid"
     },
     "require": {
-        "php": ">=5.4",
+        "php": "^5.4 || ^7.0",
         "paragonie/random_compat": "^1.0|^2.0"
     },
     "require-dev": {