Pantheon release notes

Log forwarding for Splunk and Sumo Logic is now available via a Private Beta program. There is no additional cost for this feature and anyone can request an invite by submitting this form.

For more information, see this related blog post.

When enabled, this feature streams the following log types from your Pantheon site to your external service (Splunk or Sumo Logic):

• php-fpm-error
• php-slow
• php-error
• nginx-access
• nginx-error

Share feedback: Once Beta access has been granted, users will receive a welcome email and be invited to a dedicated slack channel where you can provide feedback, ask questions and discuss usage with the Pantheon product and engineering team.

To request an invite, submit this form.

Documentation

See also, the following new docs:

• Log Forwarding Overview
• Sumo Logic Setup
• Splunk Setup

The new Site Dashboard is now available for all Workspaces. Today's release switches Personal Workspaces over to the new experience, a change we recently completed for Professional Workspaces.

The following ON/OFF toggles have been removed from the user interface:

• Personal Workspace > Site list "Open sites in new beta"
• Professional Workspace > Site list "Open sites in new beta" (removed in a previous release)

• Same functionality, familiar workflows – No need to relearn anything. Your day-to-day tasks remain unchanged.
• Modern, accessible design – We’ve made significant improvements to align with the latest usability design standards, enhancing readability, contrast, and navigation.
• Performance improvements under the hood – While this may feel mostly visual, we’ve reworked key infrastructure for long-term speed and reliability.
• Small but powerful UX upgrades – New conveniences like one-click to copy the commit SHA, along with other thoughtful touches for enhanced usability.

Following the successful rollout of PHP Runtime Generation 2 for all environments that have not opted-out, we are now preparing to remove PHP Runtime Generation 1 from the platform starting April 6, 2026.

What's changing when?

Between April 6 and April 17, 2026, all environments that have not been upgraded will be auto-upgraded to Generation 2. Opting out will no longer be available.

Action Required

Please view the Known Changes and Requirements list if you are still in the process of upgrading your site. We recommend all site owners proactively test and upgrade to Generation 2 rather than waiting for this auto-upgrade.

PHP versions 8.3.28 and 8.4.15, are now available on the platform. These updates bring the latest bug fixes, improving performance and security for your sites. The latest versions have already rolled out to all sites.

PHP 8.3.28 is available on both PHP Runtime Generation 1 and PHP Runtime Generation 2.

PHP 8.4 is only available with the new PHP Runtime Generation 2.

We are removing ionCube support from the platform on March 8, 2026. This PHP extension was prevously only available for PHP 8.1 on PHP Runtime Generation 1.

Pantheon continually reviews our PHP runtime and explores opportunities to optimize performance and build times.

If your application uses ionCube, please contact support or your Customer Success Manager to explore options for your use case.

A refreshed, modernized site migration experience is now available in the Pantheon Dashboard for all users.

Share questions and feedback in the Pantheon Community Slack.

Key Changes

• Design improvements to align with the latest usability standards for increased consistency.
• The previous Drupal migration process (which leveraged drush ard) led to failures for most users. The Drupal migration process has now been streamlined so that, when the site deployment is complete, users are instead prompted to migrate manually with crosslinks to respective docs for each step.

The latest version of WordPress, 6.9, is available on Pantheon as of December 02, 2025.

Action required

Upgrade to WordPress 6.9 right from your Pantheon dashboard or Terminus to access the latest features, fixes, and security enhancements. See related documentation for how to apply core updates.

For full details about WordPress 6.9, see the release notes

Today, Pantheon's new solution for Next.js enters Private Beta. To request an invite, submit this form.

Front-End Sites, our previous offering for Next.js, will be discontinued. We encourage users to migrate to the updated architecture.

For more information, see this related blog post.

What's new?

Some key changes for Next.js on Pantheon include:

• Improved runtime architecture, including support for Pantheon's Global CDN.
• Site creation via the command line or the dashboard.
• Sites listed in your workspace alongside WordPress and Drupal, instead of a separate tab.
• Unified site dashboard design that's consistent with WordPress and Drupal user interfaces:

For more detailed information on the differences from Front-End Sites, see our migration guide.

Documentation

For usage instructions and guidance, see the following new docs:

• Next.js Overview
• Runtime Architecture
• Limitations and considerations
• Hello World Tutorial
• Content Publisher Tutorial
• Migrating from Front-End Sites
• Managing environment variables