diff --git a/composer.json b/composer.json
index 4995e89..341d55d 100644
--- a/composer.json
+++ b/composer.json
@@ -38,7 +38,7 @@
         "ext-json": "*",
         "ext-libxml": "*",
         "psr/http-factory": "^1.0",
-        "psr/http-message": "^1.0"
+        "psr/http-message": "^1.1"
     },
     "require-dev": {
         "adriansuter/php-autoload-override": "^1.4",