Software update is required to connect iPhone?

Just upgraded to latest iOS (14.4) and am connecting to my Macbook (Catalina) and got this message "A software update is required to connect xxx's iPhone" The choices provided are Learn More, Not Now, and Install. Learn more is just a web page with not much more helpful information and NO DETAILS on what exact update is required. I do not want to click on Install because I have no idea what is going to be installed.

My iPhone connects fine via USB and functionally I am having no problems so why the `need'?