> For the complete documentation index, see [llms.txt](https://docs.os.uk/os-downloads/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.os.uk/os-downloads/products/addresses-and-names-portfolio/os-open-uprn/release-notes.md).

# Release Notes

Release notes for the OS Open UPRN product over the last year.

{% hint style="info" %}

## Please note

* Any interruptions or data issues impacting the OS Open UPRN product will be documented on the [Known Data Issues and Service Disruptions page](/os-downloads/products/addresses-and-names-portfolio/os-open-uprn/os-open-uprn-known-data-issues-and-service-disruptions.md).
* OS Open URPN is refreshed on a six-weekly basis, in-line with the AddressBase Epoch dates published on the ['Product Refresh Dates' dates page](/os-downloads/resources/product-resources/product-refresh-dates.md#addressbase-products). (The [AddressBase release notes](/os-downloads/products/addresses-and-names-portfolio/addressbase-fundamentals/release-notes.md) include information on the AddressBase, AddressBase Plus, AddressBase Premium and OS Open UPRN products, including the Full Supply record count for OS Open UPRN.)
* Areas of Interest (AOI) orders and Change-Only Updates (COUs) are not available for OS Open UPRN.
  {% endhint %}

## [OS Open UPRN – September 2026 release note](/os-downloads/products/addresses-and-names-portfolio/os-open-uprn/release-notes/september-2026.md)

This release note provides information about the September 2026 (Epoch 130) release of OS Open UPRN.

## [OS Open UPRN – August 2026 release note](/os-downloads/products/addresses-and-names-portfolio/os-open-uprn/release-notes/august-2026.md)

This release note provides information about the August 2026 (Epoch 129) release of OS Open UPRN.

## [OS Open UPRN – June 2026 release note](/os-downloads/products/addresses-and-names-portfolio/os-open-uprn/release-notes/june-2026.md)

This release note provides information about the June 2026 (Epoch 128) release of OS Open UPRN.

## [OS Open UPRN – May 2026 release note](/os-downloads/products/addresses-and-names-portfolio/os-open-uprn/release-notes/may-2026.md)

This release note provides information about the May 2026 (Epoch 127) release of OS Open UPRN.

## [OS Open UPRN – April 2026 release note](/os-downloads/products/addresses-and-names-portfolio/os-open-uprn/release-notes/april-2026.md)

This release note provides information about the April 2026 (Epoch 126) release of OS Open UPRN.

## [OS Open UPRN – February 2026 release note](/os-downloads/products/addresses-and-names-portfolio/os-open-uprn/release-notes/february-2026.md)

This release note provides information about the February 2026 (Epoch 125) release of OS Open UPRN.

## [OS Open UPRN – January 2026 release note](/os-downloads/products/addresses-and-names-portfolio/os-open-uprn/release-notes/january-2026.md)

This release note provides information about the January 2026 (Epoch 124) release of OS Open UPRN.

## [OS Open UPRN – November 2025 release note](/os-downloads/products/addresses-and-names-portfolio/os-open-uprn/release-notes/november-2025.md)

This release note provides information about the November 2025 (Epoch 123) release of OS Open UPRN.

## [OS Open UPRN – October 2025 release note](/os-downloads/products/addresses-and-names-portfolio/os-open-uprn/release-notes/october-2025.md)

This release note provides information about the October 2025 (Epoch 122) release of OS Open UPRN.


---

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