AWS DMS instance does not receive all minor updates automatically

Description

When AWS Database Migration Service (AWS DMS) supports a new version, you can upgrade your replication instances to it. There are two kinds of upgrades: major version upgrades and minor version upgrades. Minor upgrades helps maintain a secure and stable DMS with minimal impact on the replication. For this reason, we recommend that your automatic minor upgrade is enabled. Minor version upgrades only occur automatically if a minor upgrade replaces an unsafe version, such as a minor upgrade that contains bug fixes for a previous version.

Fix - Runtime

CLI Command

aws dms modify-replication-instance \
    --region ${region} \
    --replication-instance-arn ${resource_arn} \
    --auto-minor-version-upgrade \
    --apply-immediately

Fix - Buildtime

CloudFormation

Resources:
  Example:
    Type: 'AWS::DMS::ReplicationInstance'
    Properties:
      EngineVersion: 3.1.4
      ReplicationInstanceIdentifier: example
      ReplicationInstanceClass: dms.t2.micro
+     AutoMinorVersionUpgrade: true

Terraform

resource "aws_dms_replication_instance" "example" {
  engine_version               = "3.1.4"
  replication_instance_class   = "dms.t2.micro"
  replication_instance_id      = "example"
+ auto_minor_version_upgrade   = true
}