> For the complete documentation index, see [llms.txt](https://docs.buildingtransparency.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.buildingtransparency.org/ec3/release-notes.md).

# Release Notes

Changes to EC3 by release, newest first.

The latest release is **171.3.8**, released 2026-09-30. Its notes are at the top of [Last 12 months](/ec3/release-notes/last-12-months.md).

## Last 12 months

[Last 12 months](/ec3/release-notes/last-12-months.md) lists every release from 2025-10-01 to 2026-09-30, newest first.

## Archive

Older releases are in the [Archive](/ec3/release-notes/archive.md), organized by year:

* [2025](/ec3/release-notes/archive/2025.md) - releases 171.2.0 to 171.2.2 (September 2025)
* [2024](/ec3/release-notes/archive/2024.md) - release 148 (January 2024) and the April, May and June 2024 updates
* [2023](/ec3/release-notes/archive/2023.md) - releases from July to December 2023

{% hint style="info" %}
A release moves from Last 12 months to the Archive once it is more than 12 months old.
{% endhint %}