diff --git a/terraform/main.tf b/terraform/main.tf
index ea0cfba..8287249 100644
--- a/terraform/main.tf
+++ b/terraform/main.tf
@@ -97,7 +97,7 @@ resource "google_compute_instance" "container_server" {
 
   boot_disk {
     initialize_params {
-      image = "cos-cloud/cos-stable"
+      image = "cos-cloud/cos-77-lts"
     }
   }