diff --git a/composer.json b/composer.json
index 135472f..d89d732 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,7 @@
     }
   },
   "require": {
-    "php": ">=5.6",
+    "php": "^5.6|^7.0",
     "phpunit/phpunit": "^5.7",
     "psr/log": "^1.0"
   }