diff --git a/composer.json b/composer.json
index eaf0c9f..27caf31 100644
--- a/composer.json
+++ b/composer.json
@@ -5,7 +5,7 @@
     "license": "MIT",
     "require": {
         "neos/neos": "^4.0 || ^5.0 || ^7.0 || ^8.0",
-        "guzzlehttp/psr7": "^1.6"
+        "guzzlehttp/psr7": "^1.6 || ^2.0"
     },
     "autoload": {
         "psr-0": {