diff --git a/examples/postgresql/main.tf b/examples/postgresql/main.tf
index 0974f17..5cf2d69 100644
--- a/examples/postgresql/main.tf
+++ b/examples/postgresql/main.tf
@@ -32,8 +32,9 @@ module "aurora" {
   storage_type    = "aurora-iopt1"
   instances = {
     1 = {
-      instance_class      = "db.r5.2xlarge"
-      publicly_accessible = true
+      instance_class          = "db.r5.2xlarge"
+      publicly_accessible     = true
+      db_parameter_group_name = "default.aurora-postgresql14"
     }
     2 = {
       identifier     = "static-member-1"
diff --git a/main.tf b/main.tf
index af5e50f..8e617c3 100644
--- a/main.tf
+++ b/main.tf
@@ -162,7 +162,7 @@ resource "aws_rds_cluster_instance" "this" {
   ca_cert_identifier                    = var.ca_cert_identifier
   cluster_identifier                    = aws_rds_cluster.this[0].id
   copy_tags_to_snapshot                 = try(each.value.copy_tags_to_snapshot, var.copy_tags_to_snapshot)
-  db_parameter_group_name               = var.create_db_parameter_group ? aws_db_parameter_group.this[0].id : var.db_parameter_group_name
+  db_parameter_group_name               = var.create_db_parameter_group ? aws_db_parameter_group.this[0].id : try(each.value.db_parameter_group_name, var.db_parameter_group_name)
   db_subnet_group_name                  = local.db_subnet_group_name
   engine                                = var.engine
   engine_version                        = var.engine_version