I recently worked on a project which required a updated version of the jQuery library. While there is the jQuery Update module, it only allows you to upgrade Drupal 6 to jQuery 1.3. If you really know what you're doing and want to upgrade beyond that version, you can either hack core or create your own simple module to do it. While hacking core is certainly the easier approach (simply overwriting misc/jquery.js with a newer version), it is very bad practice.

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