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Pantheon release notes

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December 11, 2025

Log forwarding for Splunk and Sumo Logic is now availble 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 recieve 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:

November 18, 2025

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: The Pantheon dashboard showing a dev environment for a Next.js site

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:

September 12, 2024

RSS readers will now detect multiple release notes from the same date.

Our release note publishing process runs through Markdown and Git with published dates set manually only at the granularity of year, month, and day. RSS readers (like our Community Slack integration) ignore multiple items with identical dates and times. We have worked around this limitation by setting an arbitrary hour, minute, and second for each release note within the RSS feed by deriving a hash of the note.

August 22, 2024

Previously available only to Early Access participants, the Pantheon Secrets program is now released for Limited Availability, giving everyone access to this feature at no additional cost.

Highlights

  • Secure: Secrets are encrypted at rest and securely hosted on Pantheon.
  • Easy to use: Create and update secrets via Terminus.
  • Governable: Secrets can be set at organization level and shared with all the sites owned by that organization.
  • Overridable: Secrets can be overridden at environment level when needed.

Documentation

Learn more about this new feature by exploring our new Pantheon Secrets Guide:

July 12, 2024

We’re excited to announce the rollout of the RSS feed subscription feature. This enhancement will enable you to stay updated with the latest release notes directly in your preferred RSS reader.

Key features

  • Receive real-time notifications when new release notes are available.
  • View all the latest release notes in your RSS reader.

How to get started

  1. Select the Subscribe to RSS feed link on the Pantheon release notes homepage.
  2. Choose your preferred RSS reader to follow us.

We hope this new feature enhances your experience and keeps you well-informed. Thank you for your continued support!

June 4, 2024

We're introducing another enhancement to our release notes: the multi-select filter. Now, you can filter release notes using multiple tags simultaneously, providing a more customized and efficient way to find relevant updates.

Explore this new functionality and streamline your experience with Pantheon release notes.

new release note multi filter

March 28, 2024

What is changing?

Great news! Pantheon is simplifying the way we calculate and apply site visit overages. This change will help reduce excess billing and unplanned costs should a site exceed its plan limits.

This change is effective for site visits on or after January 1, 2024. In order to transition to the new overages model and allow you, the customer, to digest this change Pantheon will not run an overages process in February 2024. This new program will be formally launched in March 2024 and the initial month’s processing will encompass usage from January and February of 2024.

The new overage charge policy

Effective for usage starting on January 1, 2024, overages will be billed $40 for each 10,000 unique site visits (a unique site visit is defined as a specific IP address and user agent combination over a 24-hour period) or portion thereof that exceeds the amount of included unique visits in the subscription. This applies uniformly to all sites running on the platform at all subscription levels.

In addition, with Overage Protection, all Pantheon customers, except for Basic plans and monthly subscriptions, will have one month of overages waived every 12 months during the subscription term. For simplicity, the 12-month period will follow a calendar year running from January through December. This Overage Protection will be applied automatically on the first month of each plan year where your site is over the included unique visits in the subscription- you do not have to do a thing.

Lastly, for new customers coming onto the platform for the first time there will be a three-month grace period starting with your service start date (the day a site is first moved from a Sandbox to a commercial plan) where no overages will be incurred. This allows you the time to get calibrated on the platform and focus on what is most important: the successful launch of your web site(s) on Pantheon!

The prior overage charge policy

Prior to this change, if a site exceeded the unique site visits included in the subscription plan, the plan would be automatically upgraded to a higher plan level that was a better fit for the amount of unique site visits. Many times that increase would result in a surprise to customers, who hadn’t budgeted for increasing the plan for the remainder of the subscription term, and the cost would be more than what customers thought was fair. We listened, and we’re making this change to make Pantheon a brand you trust even more.

Will you show me an example of how this works?

Example scenario

Assume you purchase an annual Performance Small plan that includes 25,000 unique monthly site visits starting October 1st. The cost of a Performance Small plan is $160 per month (paid annually). Note that the next plan level up is a Performance Medium plan that includes 50,000 unique monthly site visits is $275 per month (paid annually).

During the holiday season, you have 40,000 unique site visits in November and 45,000 in December, before returning to less than 25,000 monthly unique site visits during the rest of your contract term (Jan-Sep).

Dataset for example overage scenario

Overage fee under the new policy

Under the new policy, you will simply pay a one-time fee of: $ 0 for November’s extra 15,000 visits because Overage Protection allows 1 free month of overages, and $ 80 for December’s extra 20,000 visits.

Overage fee under the old policy

Because you exceeded the plan limits of 25,000 for two consecutive months, under the old policy your plan would have been automatically upgraded to the Performance Medium plan starting in December. This would have increased your monthly cost from $160 to $275 a month, or an additional $115 per month. Since the plan change occurred in December and you still had 9 months remaining on your term, this increase would have cost $1,035 extra, which would be charged to your credit card in January or you would have received an additional invoice for plans on contract.

Comparison of the new vs. old overage fee

As you can see in this example, the new overage fee is a total of $80 vs. the cost for the upgraded plan under the prior policy would have increased your cost $1,035 –- the new policy saves you 92%!

Chart comparing price difference between the old policy and new policy

Updated documentation

We've updated our Overage Policy documentation to align with the new policy and provide more specifics, such as additional benefits for new site launches and qualifying nonprofit organizations.

January 25, 2024

As we embark on a new year, we're excited to unveil a transformation. This January marks the introduction of Pantheon release notes, a rebranding of our changelog. Our aim is to elevate your platform experience by providing even more valuable insights into product updates.

What's new?

  • Enhanced visibility: Discover our improved interface with added tags to each release note, indicating their category and whether action is required. This feature ensures quick insights at a glance, making your navigation smoother.
  • Filter functionality: Explore the convenience of our newly integrated filter functionality, allowing you to tailor your release note view based on specific tags. This feature ensures you get information that's most relevant to you.

What’s coming up?

Get ready for a streamlined and more dynamic experience with Pantheon release notes. We're committed to keeping you in the loop every step of the way, ensuring you stay informed about the latest.

  • Frequent updates: Say goodbye to waiting for a monthly summary. We're shifting from the monthly retrospective model to publishing a release note for each significant update, providing you with real-time information.
  • Proactive communication: This change supports more proactive communication. Now, any noteworthy change will be marked here, complementing other channels like blog posts and emails.

What lies ahead?

This is just the beginning! Stay tuned for more enhancements down the road as we continue to refine and elevate your Pantheon experience.

We appreciate your continued support and look forward to a year filled with collaborative success.