diff --git a/composer.json b/composer.json
index 1adbc3e..44f8e78 100644
--- a/composer.json
+++ b/composer.json
@@ -15,6 +15,7 @@
     ],
     "minimum-stability": "stable",
     "require": {
-        "potter/container": "^0.0.1"
+        "potter/container": ">=0.0.1",
+        "potter/router": ">=0.0.1"
     }
 }