diff --git a/composer.json b/composer.json
index 8e135ef..8fc6b24 100644
--- a/composer.json
+++ b/composer.json
@@ -17,6 +17,8 @@
     "require": {
         "potter/container": ">=0.0.1",
         "potter/controller": ">=0.0.1",
-        "potter/router": ">=0.0.1"
+        "potter/response": ">=0.0.1",
+        "potter/router": ">=0.0.1",
+        "psr/http-message": "^2.0.0"
     }
 }