diff --git a/app.json b/app.json
index 64ae9147..c0767d54 100644
--- a/app.json
+++ b/app.json
@@ -75,7 +75,7 @@
     "formation": {
         "worker": {
             "quantity": 1,
-            "size": "free"
+            "size": "eco"
         }
     }
 }