diff --git a/composer.json b/composer.json
index 41fbf92..37524de 100644
--- a/composer.json
+++ b/composer.json
@@ -9,6 +9,7 @@
         }
     },
     "require": {
-        "symfony/polyfill-php80": "^1.23"
+        "symfony/polyfill-php80": "^1.23",
+        "php": ">7.1"
     }
 }