diff --git a/composer.json b/composer.json
index b862bf7..e02a283 100644
--- a/composer.json
+++ b/composer.json
@@ -6,7 +6,7 @@
         "MIT"
     ],
     "require": {
-        "neos/flow": ">=4.0, <= 6.0",
+        "neos/flow": "^5.2 || ^6.0 || dev-master",
         "swiftmailer/swiftmailer": "^6.0"
     },
     "autoload": {