Introducing “Update URI” plugin header in WordPress 5.8

WordPress 5.8 introduces a new headerHeader The header of your site is typically the first thing people will experience. The masthead or header art located across the top of your page is part of the look and feel of your website. It can influence a visitor’s opinion about your content and you/ your organization’s brand. It may also look different on different screen sizes. available for pluginPlugin A plugin is a piece of software containing a group of functions that can be added to a WordPress website. They can extend functionality or add new features to your WordPress websites. WordPress plugins are written in the PHP programming language and integrate seamlessly with WordPress. These can be free in the Plugin Directory or can be cost-based plugin from a third-party authors. This allows third-party plugins to avoid accidentally being overwritten with an update of a plugin of a similar name from the The community site where WordPress code is created and shared by the users. This is where you can download the source code for WordPress core, plugins and themes as well as the central location for community conversations and organization. Plugin Directory.

Previously, any custom plugin which used the same slug than a plugin hosted on was taking a significant risk of being overwritten by an update of the latter.

WordPress 5.8 introduces a new Update URI plugin header field. If the value of this new field matches any URI other than{$slug}/ or{$slug}, WordPress will not attempt to update it.

If set, the Update URI header field should be a valid URI and have a unique hostname.

Please note that authors of plugins hosted by don’t need to use this new header.

Some examples include:

  • Update URI:
  • Update URI:
  • Update URI: my-custom-plugin-name

Update URI: false also works, and unless there is some code handling the false hostname (see the hook introduced below), the plugin will not be updated.

If the header is used on a hosted plugin, the APIAPI An API or Application Programming Interface is a software intermediary that allows programs to interact with each other and share data in limited, clearly defined ways. will only return updates for the plugin if it matches the following format:


If the header has any other value, the API will not return any result. It will ignore the plugin for update purposes.

Additionally, WordPress 5.8 introduce the update_plugins_{$hostname} filterFilter Filters are one of the two types of Hooks They provide a way for functions to modify data of other functions. They are the counterpart to Actions. Unlike Actions, filters are meant to work in an isolated manner, and should never have side effects such as affecting global variables and output., which third-party plugins can use to offer updates for a given hostname.

This new hook filters the update response for a given plugin hostname. The dynamic portion of the hook name, $hostname, refers to the hostname of the URI specified in the Update URI header field.

The hook has four arguments:

  • $update: The plugin update data with the latest details. Default false.
  • $plugin_data: The list of headers provided by the plugin.
  • $plugin_file: The plugin filename.
  • $locales: Installed locales to look translations for.

They can be used to filter the update response in multiple use cases.

For reference, see tickets #32101, #23318, and changelog [50921].

Thanks @milana_cap for proofreading.

#5-8, #dev-notes