diff --git a/composer.json b/composer.json
index c5cfd26..7736e69 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
         "email": "i.pfennigstorf@gmail.com"
     }],
     "require": {
-        "php": "^8.0",
+        "php": "^8.1",
         "jms/serializer": "^3.17",
         "subugoe/iiif-model": "^0.2.4",
         "doctrine/collections": "^2.0"