WordPress 2.9 Carmen just launched couple days ago.
Recent versions of WordPress feature an Automatic Upgrade option. Just click Upgrade Automatically and within a minute, it’s done.

However, this time I had an error about allowed memory size exhausted.

This error message is because WordPress exceeding it’s predetermined memory limit in PHP environment.
Luckily, there is an easy solution.
WordPress sets its memory limits within the wp-settings.php file.
All has to be done is change the memory limit from 32M to 64M.

Now, upgrade WordPress to the latest version without any problem.
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