diff --git a/composer.json b/composer.json
index 8829e722..0eee225d 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
     }
   ],
   "require": {
-    "php": ">=5.5",
+    "php": ">=7.1",
     "ext-gd": "*"
   },
   "autoload": {