Update Xcode 9.4.1

Hi all, I am new to this and need some direction.
I am developing on a windows 10 enviroment using the Flutter developement tool to build my application. I have no problems with the Android part but trying to deploy my app to the Apple Store is a huge issue to understand.

In deploying I am getting the following error message where I need some assistance to fix this.

Found “Xcode 9.4.1, Build version 9F2000”. Xcode 11.0 or greater is required to develop for iOS.
4207Encountered error while building for device.
4208The command “flutter/bin/flutter build ios --debug --no-codesign” exited with 1.

Could someone help me how to fix this using the Window visual tool