diff --git a/app.yaml b/app.yaml
index 0ffa429..e93b4f7 100644
--- a/app.yaml
+++ b/app.yaml
@@ -2,8 +2,10 @@ runtime: nodejs
 env: flex
 
 # https://cloud.google.com/appengine/docs/flexible/nodejs/configuring-your-app-with-app-yaml
-manual_scaling:
-  instances: 1
+automatic_scaling:
+  min_num_instances: 1
+  max_num_instances: 4
+  cool_down_period_sec: 180
 resources:
   cpu: 1
   memory_gb: 0.5