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Heroku Blog

Heroku March 2026 Update

We’ve transitioned to a Sustaining Engineering model to better serve the customers who rely on us every day. Our mission is simple: to provide the most stable, secure, and reliable environment for your apps and data. We will continue releasing features and functionality that align with our Sustaining Engineering goals and provide a more robust and efficient platform to our customers.

Today we are excited to share three recent enhancements:

Modernizing the Command Line: Heroku CLI v11

Heroku CLI v11 is now available. This release represents the most significant architectural overhaul in years, completing our migration to ECMAScript Modules (ESM) and oclif v4. This modernization brings faster performance, a new semantic color system, and aligns the CLI with modern JavaScript standards.

While v11 introduces breaking changes to legacy namespaces, the benefits are substantial: better performance, improved maintainability, and enhanced usability that simplifies how you manage Heroku resources from the command line.

Bigger Slugs and Greater Build Timeout Flexibility

Modern applications, especially those leveraging AI and data-heavy libraries, need more room to breathe. To support these evolving stacks and reduce developer friction, we’ve increased the default maximum compressed slug size from 500MB to 1GB.

Behind the Scenes: How Maintaining Cloud Native Buildpacks Powers Platforms Like Heroku

Most developers never see the 11 pack releases we shipped in the last 14 months as pack CLI maintainers. That’s actually a good sign—it means the infrastructure just works. When a critical vulnerability emerges requiring an immediate upgrade, the fix is shipped within days.

Here’s what most developers don’t see: that same security patch now protects every buildpack user across Heroku, Google Cloud, Openshift, VMware Tanzu, and thousands of internal platforms.

From Fragmented Logs to Full-Stack Visibility with SolarWinds Papertrail

Modern applications on Heroku don’t just consist of code. They are living ecosystems comprised of dynos, databases, third-party APIs, and complex user interactions. As these systems scale, so do the logs and metrics. To efficiently extract the signals from the noise you need to understand system health in the context of external factors, like resource limits . While Heroku removes the pain of managing servers, observability is critical for monitoring service interactions and performance optimization.

Preparing for Shorter SSL/TLS Certificate Lifetimes

The web browser and certificate authority industry is shortening the maximum allowed lifetime of TLS certificates. These changes will improve security on the Web, but you may have to change certificate maintenance practices for apps you run on Heroku.

The good news is that if you’re using Heroku Automated Certificate Management, no changes are required: Heroku already refreshes and updates certificates on your apps according to the new policies.

If you maintain and upload …

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