diff --git a/composer.json b/composer.json
index 0f9aca0..7d62825 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
         }
     ],
     "require": {
-      "php": ">=5.3.3",
+      "php": ">=7.1",
       "ext-mbstring": "*",
       "ext-pcre": "*",
       "ext-pdo": "*",