diff --git a/fly.toml b/fly.toml
index 4d96844..6d7a191 100644
--- a/fly.toml
+++ b/fly.toml
@@ -1,5 +1,5 @@
+# fly.toml
 app = "postconvert"
-
 primary_region = "sjc"
 
 [build]
@@ -8,11 +8,16 @@ primary_region = "sjc"
 [http_service]
   internal_port = 8080
   force_https = true
+
   auto_start_machines = true
   auto_stop_machines = true
   min_machines_running = 0
-  max_machines_running = 1
-  concurrency = { soft_limit = 1, hard_limit = 1 }
+  max_machines_running = 10
+
+  # Allow 2 concurrent connections so /health can succeed while /convert is running.
+  # We enforce "only 1 conversion at a time" in server.js.
+  concurrency = { soft_limit = 2, hard_limit = 2 }
+
   grace_period = "30s"
 
 [[http_service.checks]]
@@ -20,4 +25,4 @@ primary_region = "sjc"
   interval = "15s"
   method = "GET"
   path = "/health"
-  timeout = "2s"
+  timeout = "5s"