Cloud Platforms
The issue is now resolved.
Customers using Heroku in the Common Runtime may have experienced intermittent dyno disruptions earlier today between 17:50 UTC and 20:24 UTC. The issue has been resolved after we disabled a related service and rolled back a recent change. We’re validating the update in lower environments and will continue monitoring for stability.
The maintenance is now complete. All functionality has now returned to normal.
We’ve confirmed that the solution implemented to mitigate the issue causing the service disruption was successful. Engineers have observed that the service is stable and have resolved the incident. Customers should no longer see any impact. We will fully investigate the incident, confirming the technical trigger, the underlying cause, and preventive action to avoid a repeat in the future. We apologize for how you and your business may have been affected by this incident.
The maintenance is now complete. All functionality has now returned to normal.
The maintenance is now complete. All functionality has now returned to normal.
At 13:46 UTC, on January 15, 2026, teams completed validation and confirmed the incident has been resolved after the new certificate was propagated to all impacted environments. We apologize for how this incident may have affected you and your business. We will perform a full investigation of the incident, confirming the technical trigger, the underlying cause, and preventive action to avoid a repeat in the future.
This has been resolved.
We sincerely apologize for the impact this issue caused you and your business. Our goal is to provide world-class service to our customers, and we are continuously assessing and improving our tools, processes, and architecture to provide our customers with the best service possible. Please find the Root Cause Analysis here. If you have additional questions or need further support, please open a case with Support via the Help portal.
Services restored at 18:35:30 UTC on September 26, 2025.
Beginning at 23:17 UTC on September 24, 2025 and continuing until 00:39 UTC on September 25, 2025, impacted customers experienced elevated H99 errors on network runtime in US & EU. This issue is now resolved.
Engineers confirmed an issue with the vendor's gpt-oss-120b model has been restored.
The upstream DNS issue impacting Heroku has been resolved. New apps and domains created during and after the time of will resolve effectively within normal DNS timeframes in all regions. Customers should no longer see errors and DNS performance is operating normally. We continue to actively monitoring the situation to ensure full reliability and will provide further updates as needed.
A kernel update has been deployed to all Common Runtime regions. Dyno relocations have resumed regular activity levels.
The incident is now resolved.