diff --git a/README.md b/README.md
index e825d95..c755eeb 100644
--- a/README.md
+++ b/README.md
@@ -125,6 +125,7 @@ No modules.
 | <a name="input_data_reader_route53_zone_id"></a> [data\_reader\_route53\_zone\_id](#input\_data\_reader\_route53\_zone\_id) | If specified a data reader route53 record will be created | `string` | `""` | no |
 | <a name="input_data_reader_tags"></a> [data\_reader\_tags](#input\_data\_reader\_tags) | A map of tags to add to data reader resources. | `map(string)` | `{}` | no |
 | <a name="input_db_cluster_parameter_group_name"></a> [db\_cluster\_parameter\_group\_name](#input\_db\_cluster\_parameter\_group\_name) | The name of a DB Cluster parameter group to use | `string` | `"default.aurora5.6"` | no |
+| <a name="input_db_cluster_db_instance_parameter_group_name"></a> [db\_cluster\_db\_instance\_parameter\_group\_name](#input\_db\_cluster\_db\_instance\_parameter\_group\_name) | Instance parameter group to associate with all instances of the DB cluster. The db\_instance\_parameter\_group\_name parameter is only valid in combination with the allow\_major\_version\_upgrade parameter. | `any` | `null` | no |
 | <a name="input_db_parameter_group_name"></a> [db\_parameter\_group\_name](#input\_db\_parameter\_group\_name) | The name of a DB parameter group to use | `string` | `"default.aurora5.6"` | no |
 | <a name="input_delete_timeout"></a> [delete\_timeout](#input\_delete\_timeout) | Timeout used for destroying cluster. This includes any cleanup task during the destroying process. | `string` | `"120m"` | no |
 | <a name="input_deletion_protection"></a> [deletion\_protection](#input\_deletion\_protection) | The database can't be deleted when this value is set to true. | `bool` | `true` | no |
diff --git a/main.tf b/main.tf
index 95d90e0..ddc567a 100644
--- a/main.tf
+++ b/main.tf
@@ -26,27 +26,28 @@ resource "aws_db_subnet_group" "main" {
 resource "aws_rds_cluster" "main" {
   count = var.create_resources ? 1 : 0
 
-  allow_major_version_upgrade     = var.allow_major_version_upgrade
-  cluster_identifier              = "${var.identifier_prefix}${var.name}"
-  engine                          = var.engine
-  engine_version                  = var.engine_version
-  kms_key_id                      = var.kms_key_id
-  master_username                 = var.username
-  master_password                 = local.master_password
-  deletion_protection             = var.deletion_protection
-  final_snapshot_identifier       = "${var.final_snapshot_identifier_prefix}${var.name}-${random_id.snapshot_identifier[0].hex}"
-  skip_final_snapshot             = var.skip_final_snapshot
-  backup_retention_period         = var.backup_retention_period
-  preferred_backup_window         = var.preferred_backup_window
-  preferred_maintenance_window    = var.preferred_maintenance_window
-  port                            = local.port
-  db_subnet_group_name            = aws_db_subnet_group.main[0].name
-  vpc_security_group_ids          = concat([aws_security_group.main[0].id], var.extra_security_groups)
-  snapshot_identifier             = var.snapshot_identifier
-  storage_encrypted               = var.storage_encrypted
-  apply_immediately               = var.apply_immediately
-  db_cluster_parameter_group_name = var.db_cluster_parameter_group_name
-  tags                            = var.tags
+  allow_major_version_upgrade      = var.allow_major_version_upgrade
+  cluster_identifier               = "${var.identifier_prefix}${var.name}"
+  engine                           = var.engine
+  engine_version                   = var.engine_version
+  kms_key_id                       = var.kms_key_id
+  master_username                  = var.username
+  master_password                  = local.master_password
+  deletion_protection              = var.deletion_protection
+  final_snapshot_identifier        = "${var.final_snapshot_identifier_prefix}${var.name}-${random_id.snapshot_identifier[0].hex}"
+  skip_final_snapshot              = var.skip_final_snapshot
+  backup_retention_period          = var.backup_retention_period
+  preferred_backup_window          = var.preferred_backup_window
+  preferred_maintenance_window     = var.preferred_maintenance_window
+  port                             = local.port
+  db_instance_parameter_group_name = var.allow_major_version_upgrade ? var.db_cluster_db_instance_parameter_group_name : null
+  db_subnet_group_name             = aws_db_subnet_group.main[0].name
+  vpc_security_group_ids           = concat([aws_security_group.main[0].id], var.extra_security_groups)
+  snapshot_identifier              = var.snapshot_identifier
+  storage_encrypted                = var.storage_encrypted
+  apply_immediately                = var.apply_immediately
+  db_cluster_parameter_group_name  = var.db_cluster_parameter_group_name
+  tags                             = var.tags
 
   timeouts {
     create = var.create_timeout
diff --git a/variables.tf b/variables.tf
index ebaeaeb..de39af8 100644
--- a/variables.tf
+++ b/variables.tf
@@ -39,6 +39,11 @@ variable "allow_major_version_upgrade" {
   default     = false
 }
 
+variable "db_cluster_db_instance_parameter_group_name" {
+  description = "Instance parameter group to associate with all instances of the DB cluster. The db_instance_parameter_group_name parameter is only valid in combination with the allow_major_version_upgrade parameter."
+  default     = null
+}
+
 variable "allowed_security_groups" {
   description = "A list of Security Group ID's to allow access to."
   default     = []