Pantheon release notes

The latest update to the Pantheon Advanced Page Cache Drupal module includes a change regarding module compatibility to ensure the best performance for your site.

Key Update

The BigPipe module is fundamentally incompatible with the architecture of Pantheon's Global CDN and the functionality provided by Pantheon Advanced Page Cache module. To improve site reliability, the module will now automatically disable BigPipe when Pantheon Advanced Page Cache is enabled.

If the BigPipe module is somehow enabled after PAPC is installed, a clear error message will now be displayed on the Drupal Status Report page (/admin/reports/status).

This warning clearly highlights the fatal incompatibility and the risk of site errors.

The following updates are now available for Content Publisher:

• New release of the Pantheon Content Publisher v1.0.3 Drupal module now availabe.
• With Approval Workflows enabled, Administrators now have the option to Approve submissions direclty from the Pending approval tab of a Collection in the Content Dashboard. Previously, opening each submission in Preview mode was required.
• The experience for Smart Components has been improved for first time users.
• Upgrade Content Publisher AI metadata suggestion to use Gemini 2.5 flash instead of Gemini 2.0.
• Bug fix for our Next.js starter kit and SDK to properly support Next.js 15.5 and the use of App Router. Improve the build process by using pinned versions of dependencies.
• Fix several event tracking issues in the back-end.

Tika 1.18 and 1.21 will no longer be available starting January 19, 2026. Impacted sites must upgrade to Tika 3.2 which is available via PHP Runtime Generation 2.

The Apache Tika toolkit detects and extracts metadata and structured text content from various documents using existing parser libraries. On the Pantheon platform, our customers tend to use Tika to parse PDF content for searching with Solr.

Action Required

For most customers, we expect the upgrade to be seamless and not require any manual intervention. But if your site has a custom Tika integration, we recommend you follow our documentation for upgrading to Tika 3 as soon as possible to ensure your site continues to operate as expected.

Sites which have not upgraded to Tika 3 as of January 19, 2026, will be automatically upgraded. Setting tika_version: 1 in pantheon.yml will be ignored after that date. Symlinks from the 1.xx jar filepaths (/srv/bin/tika-app-1.xx.jar) will point to the new Tika 3 jar (/opt/pantheon/tika/tika.jar). These symlinks will be removed later in 2026.

As part of Pantheon's Long-Term Support (LTS) for Drupal 7, Drupal 7.105 is now available with a critical security patch.

In order to swiftly provide security coverage for a discovered vulnerability, both 7.104 and 7.105 have been included in a 7.105 tag for the drops-7 upstream.

• 7.104: This backports a prototype pollution fix in the BBQ JavaScript library used by several popular modules, including Views, Overlay and Module Filter. Of the usages inspected, only Overlay was found to be using BBQ in a vulnerable manner. If you cannot upgrade immediately, the issue can be mitigated by uninstalling Overlay module. If Overlay is not installed, then this update is not needed.

• 7.105: This adds support for PHP 8.4. If you do not run and/or do not plan to run your site on PHP 8.4, you do not need this update. Because of the many deprecation notices added to PHP 8.4, it is recommended that ini_set('error_reporting', E_ALL & ~E_DEPRECATED & ~E_USER_DEPRECATED) or some equivalent is added to the site's settings.php file.

Action required

Apply the latest upstream update to your Drupal 7 site to receive these updates. See related documentation for how to apply core updates.

About Drupal 7 Long-Term Support

Pantheon has partnered with Tag1 Consulting to deliver security updates and maintenance for Drupal 7 sites until at least January 5, 2027. This extended support is included at no additional cost.

For configuration guidance and detailed information, visit our related documentation.

PHP Runtime Generation 2 will not include wkhtmltopdf.

Pantheon has included wkhtmltopdf with our PHP Runtime since 2012 as a tool for generating PDFs on-demand. This is commonly used by sites that have the print and entity_print Drupal modules configured.

However, wkhtmltopdf has not been updated by its maintainers for 5 years and is considered abandoned. As a result, we are not including wkhtmltopdf with PHP Runtime Generation 2.

Sites that are using wkhtmltopdf should switch to dompdf. Dompdf is a PHP-based rendering engine that can be placed inside a site's codebase. Please refer to the External Libraries documentation for information on how to make this switch.

PHP Runtime Generation 2 will begin rolling out September 24. If you need more time to switch to dompdf, we recommend opting out for now.

Editorial note: The date has been moved from November 12 to December 9.

Sites running Drupal 9.4+ will no longer be able to access Solr 3 via Pantheon Search services starting December 9, 2025. 

After this date, affected sites will not be able to fetch Solr search results or index new content using Solr 3. Views or blocks that rely on Solr-powered Search API indexes may fail to load, return no results, or throw errors.

To find out which version of Solr your site is running, go to your site in the Pantheon Dashboard > Status. Look for the Solr value in the Software Versions block. 

This follows our recent announcement of Pantheon Search no longer being available for Drupal 8-9.3.

Action Required

Affected Drupal sites will need to upgrade to Solr 8 and search_api_pantheon 8.2+. A Solr upgrade guide is available in our documentation.

Alternatively, Pantheon Search can be disabled, and site owners may choose to implement Drupal’s built-in database search or a third-party search service provider.

All WordPress plugins and Drupal modules actively maintained by Pantheon have been confirmed to be compatible with PHP 8.4. Most did not require any code updates to be compatible, so they did not receive a version bump.

• Pantheon Advanced Page Cache (WordPress)
• Pantheon WordPress mu-plugin
• WP Redis
• WP Native PHP Sessions
• WP SAML Auth
• Pantheon HUD
• Search API Pantheon
• Pantheon Advanced Page Cache (Drupal)
• Pantheon Content Publisher (Drupal)

PHP 8.4 is now available on the Pantheon platform. Learn more about the release.

Editorial note: The date has been moved from October 21 to December 2.

As part of our ongoing platform maintenance and security improvements, sites on the platform running Drupal 8.0-9.3 will no longer be able to access Pantheon Search services (Apache Solr-based search) starting December 2, 2025.

After this date, affected sites will not be able to fetch Solr search results or index new content. Views or blocks that rely on Solr-powered Search API indexes may fail to load, return no results, or throw errors.

Drupal 8 reached end-of-life (EOL) in November 2021 and Drupal 9 in November 2023. EOL software does not receive security or feature updates, and could expose sites to attack if any vulnerabilities or exploits are discovered.

To find out which version of Drupal your site is running, go to your site in the Pantheon Dashboard > Status then look for the Drupal value in the Status block, or use the Terminus CLI command terminus drush <site>.<env> status.

Action Required

Affected Drupal 8.0-9.3 sites will need to be upgraded to Drupal 9.4+, Solr 8, and search_api_pantheon 8.2+. Drupal core and Solr upgrade guides are available in our documentation.

Alternatively, Pantheon Search can be disabled and site owners may choose to implement Drupal’s built-in database search or another alternative such as a third-party search service provider.