diff --git a/composer.json b/composer.json
index a547371..31a8564 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
         "guzzlehttp/psr7": "^2.0",
         "php-http/message": "^1.5",
         "php-http/curl-client": "^2.1",
-        "psr/http-message": "^1.0"
+        "psr/http-message": "^1.0|^2.0"
     },
     "require-dev": {
         "php-http/mock-client": "^1.0",