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Outage in Pantheon

Git Push and deployment Operations Failing

Resolved Major
July 03, 2026 - Started 15 days ago - Lasted about 7 hours
Official incident page

Incident Report

Summary AI Generated

A dependency version mismatch on a subset of Pantheon's Git servers caused server-side pre-receive hooks to crash, blocking all Integrated Composer builds from pushing artifacts to Git repositories and partially affecting Multidev environment creation. Live sites remained fully operational with no data loss, but new code deployments were completely halted for approximately 7.2 hours. Pantheon deployed a fix to the affected infrastructure, confirmed successful Git operations via the Dashboard, and resolved the incident after a monitoring period.

Sites are unable to complete builds via Integrated Composer. Builds complete successfully but fail at the final step when the platform attempts to push build artifacts back to the site's Git repository. Customers will see their deploy workflow fail with a pre-receive hook declined error. No data loss is occurring. Live sites are not affected; only new code deployments are blocked. We have identified the root cause. A dependency version mismatch on a subset of our Git servers is causing a server-side pre-receive hook to crash when build artifacts are pushed. This is a Pantheon infrastructure issue and is not caused by any customer code or configuration. No action is required on your end. Do not make changes to your repository or Composer configuration. We will update this page as remediation progresses. We will update within 2 hours, or sooner if the status changes.
Components affected
Pantheon Workflow Operations

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Latest Updates ( sorted recent to last )
RESOLVED 15 days ago - at 07/03/2026 02:00PM

This incident has been resolved.

MONITORING 15 days ago - at 07/03/2026 11:10AM

A fix has been deployed, and the Dashboard is now displaying successful Git operations.

We are monitoring the affected sites closely to ensure related features are functioning within expectation to confirm issues are completely resolved. We will provide a final update once the resolution is verified.

If you continue to experience the same issue, please contact us directly at helpdesk@pantheon.io.

IDENTIFIED 15 days ago - at 07/03/2026 09:20AM

We have identified that this may partially affect spinning up of Multidev environments.

We are continuing to work on a fix for this issue. The next update will be in 2 hours or as soon as we have more details.

IDENTIFIED 15 days ago - at 07/03/2026 06:50AM

Sites are unable to complete builds via Integrated Composer. Builds complete successfully but fail at the final step when the platform attempts to push build artifacts back to the site's Git repository.

Customers will see their deploy workflow fail with a pre-receive hook declined error. No data loss is occurring. Live sites are not affected; only new code deployments are blocked.

We have identified the root cause. A dependency version mismatch on a subset of our Git servers is causing a server-side pre-receive hook to crash when build artifacts are pushed. This is a Pantheon infrastructure issue and is not caused by any customer code or configuration.

No action is required on your end. Do not make changes to your repository or Composer configuration. We will update this page as remediation progresses.

We will update within 2 hours, or sooner if the status changes.

Latest Pantheon outages

Degraded platform workflows - about 1 month ago
Dashboard Loading Issues - about 2 months ago
Drupal 10/11 Site Creation Failing - about 2 months ago

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