diff --git a/composer.json b/composer.json
index 973caa7..120a834 100644
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,7 @@
         "psr/http-client-implementation": "^1.0",
         "psr/http-factory": "^1.0",
         "psr/http-factory-implementation": "^1.0",
-        "psr/http-message": "^1.0"
+        "psr/http-message": "^1.0|^2.0"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^3.0",