diff --git a/aws-rds-dbcluster/aws-rds-dbcluster.json b/aws-rds-dbcluster/aws-rds-dbcluster.json
index f966131a..42b3dfbb 100644
--- a/aws-rds-dbcluster/aws-rds-dbcluster.json
+++ b/aws-rds-dbcluster/aws-rds-dbcluster.json
@@ -88,8 +88,7 @@
     },
     "DBClusterParameterGroupName": {
       "description": "The name of the DB cluster parameter group to associate with this DB cluster.",
-      "type": "string",
-      "default": "default.aurora5.6"
+      "type": "string"
     },
     "DBSubnetGroupName": {
       "description": "A DB subnet group that you want to associate with this DB cluster.",
@@ -175,8 +174,7 @@
     },
     "MonitoringInterval": {
       "description": "The interval, in seconds, between points when Enhanced Monitoring metrics are collected for the DB cluster. To turn off collecting Enhanced Monitoring metrics, specify 0. The default is 0.",
-      "type": "integer",
-      "default": 0
+      "type": "integer"
     },
     "MonitoringRoleArn": {
       "description": "The Amazon Resource Name (ARN) for the IAM role that permits RDS to send Enhanced Monitoring metrics to Amazon CloudWatch Logs.",
@@ -224,8 +222,7 @@
     },
     "RestoreType": {
       "description": "The type of restore to be performed. You can specify one of the following values:\nfull-copy - The new DB cluster is restored as a full copy of the source DB cluster.\ncopy-on-write - The new DB cluster is restored as a clone of the source DB cluster.",
-      "type": "string",
-      "default": "full-copy"
+      "type": "string"
     },
     "ServerlessV2ScalingConfiguration": {
       "description": "Contains the scaling configuration of an Aurora Serverless v2 DB cluster.",
diff --git a/aws-rds-dbinstance/aws-rds-dbinstance.json b/aws-rds-dbinstance/aws-rds-dbinstance.json
index 336abe46..7e13da23 100644
--- a/aws-rds-dbinstance/aws-rds-dbinstance.json
+++ b/aws-rds-dbinstance/aws-rds-dbinstance.json
@@ -145,7 +145,6 @@
     "BackupRetentionPeriod": {
       "type": "integer",
       "minimum": 0,
-      "default": 1,
       "description": "The number of days for which automated backups are retained. Setting this parameter to a positive number enables backups. Setting this parameter to 0 disables automated backups."
     },
     "CACertificateIdentifier": {
@@ -388,7 +387,6 @@
     "PromotionTier": {
       "type": "integer",
       "minimum": 0,
-      "default": 1,
       "description": "A value that specifies the order in which an Aurora Replica is promoted to the primary instance after a failure of the existing primary instance."
     },
     "PubliclyAccessible": {