Advnaced users of WordPress may be familiar with WordPress’ Subversion (SVN) access. SVN allows the WordPress developers to work on code and aggregate the changes in a single location so that the software can be deployed. The most fresh version of WordPress is always available via SVN.

Unfortunately for users who have pre-configured their servers to use the latest stable version of the code, the trunk (typically the part of the SVN repository containing the latest development) is no longer the last stable version.

To get the latest 1.5 code, you’ll need to run:

svn export http://svn.automattic.com/wordpress/branches/1.5/ {wpdirectory}

Where {wpdirectory} is the directory on the server that houses your WordPress install. Usually this command is run via SSH. You can save this in a shell script to obviate remembering the URL.

You can also get the current 1.5 branch code via Tortoise SVN by using the Switch command on the context menu. Set the repo to http://svn.automattic.com/wordpress/branches/1.5/ and your source should automatically be updated to the (latest) version.

Note that there is currently (as of this writing) not a tag for in the SVN repo.

If you have no idea what I’m talking about, just go over to WordPress.org, download the zip file for version, and upload the files contained therein to your WordPress directory however you normally do so.

This version does not include any new features but does address some security concerns that could leave your site vulnerable to malicious hackers. You should probably upgrade as soon as you can.