Here is how you can change your site's jQuery version:
1. Select the Settings gear icon in the gray navigation bar.
2. Hover over Extras under the Settings header, and select Development.
Note: Changing the version of the jQuery library included with your site is not recommended or supported. Please only consider doing this if you have very specific needs (e.g., requirements of a custom plugin you're including) and can test your site thoroughly on various browsers and devices. The website will periodically update all included jQuery versions to the most recent patch/revision number for all versions available, without notice.