diff --git a/README.md b/README.md
index 531e176..9bf5147 100644
--- a/README.md
+++ b/README.md
@@ -75,7 +75,7 @@ module "ecs_cluster" {
 
 | Name | Version |
 |------|---------|
-| <a name="provider_aws"></a> [aws](#provider\_aws) | 5.21.0 |
+| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 3.0 |
 ## Modules
 
 | Name | Source | Version |
diff --git a/main.tf b/main.tf
index 17c9262..2644ea7 100644
--- a/main.tf
+++ b/main.tf
@@ -110,7 +110,7 @@ module "lb" {
   access_logs_enabled       = var.alb_access_logs_enabled
   access_logs_force_destroy = var.alb_access_logs_force_destroy
   access_logs_prefix        = var.alb_access_logs_prefix
-  vpc_id                    = data.aws_subnet.lb.0.vpc_id
+  vpc_id                    = join("", data.aws_subnet.lb.*.vpc_id)
 
   context = module.this.context
 }