diff --git a/composer.json b/composer.json
index e11f2f21..684d8335 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
   "license": "Apache-2.0",
   "require": {
     "php": ">=8.1",
-    "guzzlehttp/psr7": "^1.7|^2.0",
+    "guzzlehttp/psr7": "3.1.0",
     "psr/http-message": "^2.0",
     "cloudevents/sdk-php": "^1.0"
   },