This time its only a single update to the system that requires a whole Master update. We implemented the latest stable release of jquery into our system. Please check your projects site code for deprecated jquery functions that you might use. Deprecation list: https://api.jquery.com/category/deprecated/
We need to mention that older jquery plugins that might come to use on your site will stop working at that point. Upon request we can install a fallback solution for your Sites on an older jquery version.