Pulumi has introduced two new features to manage the complexity of large infrastructure projects by facilitating the automatic updating of dependent stacks. The first feature, Deployment Webhook Destinations, enables the automatic triggering of updates in downstream stacks whenever a node in the dependency graph is updated. The second feature, the Pulumi Auto Deploy Package, simplifies the expression of stack dependencies and automates the creation and updating of necessary Deployment Webhooks. These features aim to reduce coordination costs by ensuring that changes in one part of the infrastructure are automatically propagated to dependent components, thereby maintaining up-to-date infrastructure without relying on manual processes. Pulumi's tools, including Deployment Webhook Destinations and Pulumi Auto Deploy, aim to streamline infrastructure management through automation, providing a scalable solution for infrastructure updates.