In this final part of a series on securely managing AWS credentials within CI/CD workflows, the focus is on using Pulumi to update AWS resources securely while storing sensitive data. The article emphasizes the transition from using IAM User access keys, which have long-term drawbacks, to assuming IAM Roles that provide short-lived and task-specific permissions, thereby enhancing security. It details the creation of an IAM Role, WebsiteStackUpdaterRole, which is tailored to grant only the necessary permissions for specific Pulumi stack updates, ensuring that access is restricted to authorized users. The text also discusses how Pulumi securely stores sensitive data, highlighting the use of encrypted configuration and checkpoint files, as well as the option for users to implement custom secret providers for heightened security. Overall, the series provides a comprehensive guide to best practices in managing AWS access and safeguarding sensitive data in cloud environments using Pulumi.