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Documentation | 2025.5

# What's New in P4 Code Review 2025.1

Released: April 2025

For a complete list of what’s new and bug fixes in this release, see the release notes.

## Ability to select code in diff view

In the review page of Swarm, you can now select the code on just the left side or right side of the review diff panel.

## Library and security updates

Several libraries have been updated and security enhancements have been made based on recent assessments. These library and security updates lay the groundwork for future Swarm releases coming later this year.

## Request Review disabled for large changelists

The Request Review button is disabled if the number of files in a changelist exceeds the `max_changelist_files` configurable found in the `config.php` file. This is to improve the performance of the changelist page. See Changelist files limit.

## Added support for RHEL 9.5

Swarm now supports RHEL 9 release 9.5. See Install P4 Code Review on RHEL 9.

## Modernized documentation design

Updated the documentation to use a more modern look and feel.

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