diff --git a/composer.json b/composer.json
index 4c9387f1..5dfcba28 100644
--- a/composer.json
+++ b/composer.json
@@ -34,7 +34,7 @@
         "amphp/socket": "^1",
         "amphp/sync": "^1.3",
         "league/uri": "^6",
-        "psr/http-message": "^1"
+        "psr/http-message": "^1 | ^2"
     },
     "require-dev": {
         "ext-json": "*",