diff --git a/composer.json b/composer.json
index 747dc3b..e74c747 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
         }
     ],
     "require": {
-        "php" : "~5.6|~7.0"
+        "php" : "^7.0"
     },
     "require-dev": {
         "orchestra/testbench": "~3.0",