diff --git a/composer.json b/composer.json
index b4cdd65..2fc02aa 100644
--- a/composer.json
+++ b/composer.json
@@ -27,7 +27,7 @@
     }
   ],
   "require": {
-    "php": "^7.1",
+    "php": ">=7.1",
     "ext-mbstring": "*"
   },
   "suggest": {