diff --git a/app.json b/app.json
index 8a47d9b..b06bf37 100644
--- a/app.json
+++ b/app.json
@@ -40,7 +40,7 @@
     "formation": {
         "worker": {
             "quantity": 1,
-            "size": "free"
+            "size": "ECO"
         }
     }
-}
\ No newline at end of file
+}