diff --git a/terraform/modules/cf_to_pubsub/cf_to_pubsub.tf b/terraform/modules/cf_to_pubsub/cf_to_pubsub.tf
index d957e26..411e297 100644
--- a/terraform/modules/cf_to_pubsub/cf_to_pubsub.tf
+++ b/terraform/modules/cf_to_pubsub/cf_to_pubsub.tf
@@ -57,6 +57,7 @@ resource "google_cloudfunctions_function" "function" {
   source_archive_object = google_storage_bucket_object.remote_archive.name
   trigger_http          = true
   entry_point           = "main"
+  max_instances         = 4
   ingress_settings      = "ALLOW_ALL"
   # ingress_settings      = "ALLOW_INTERNAL_ONLY"