diff --git a/infra/ecs.tf b/infra/ecs.tf
index c489e79..5621b0d 100644
--- a/infra/ecs.tf
+++ b/infra/ecs.tf
@@ -243,14 +243,14 @@ resource "aws_security_group" "ecs" {
     from_port       = var.app_container_port
     to_port         = var.app_container_port
     security_groups = [aws_security_group.alb.id]
-    cidr_blocks = [ aws_subnet.us-east-2a.cidr_block, aws_subnet.us-east-2b.cidr_block ]
+    cidr_blocks = [ aws_vpc.this.cidr_block ]
   }
 
   ingress {
     protocol        = "tcp"
     from_port       = var.payment_container_port
     to_port         = var.payment_container_port
-    cidr_blocks = [ aws_subnet.us-east-2a.cidr_block, aws_subnet.us-east-2b.cidr_block ]
+    cidr_blocks = [ aws_vpc.this.cidr_block ]
   }
 
   egress {