diff --git a/composer.json b/composer.json
index ae706ba..9dbc29c 100644
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,7 @@
         }
     ],
     "require": {
-        "php": "^5.6|^7.0",
+        "php": "^5.6|^7.0|^8.0",
         "nanbando/humbug_get_contents": "^1.0"
     },
     "require-dev": {