diff --git a/composer.json b/composer.json
index 36a1c35..c8a8ab9 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
         "psr/http-server-middleware": "^1.0",
         "psr/http-message": "^1.0",
         "psr/event-dispatcher": "^1.0",
-        "game-worker/kiri-http-message": "dev-master"
+        "game-worker/kiri-http-message": "v1.0"
     },
     "autoload": {
         "psr-4": {