Can't add Swift Package using File > Add Packages ... in Xcode 13 beta

I created a new iOS project and now I'm trying to add Alamofire as a dependency using Xcode (which uses Swift Package Manager under the hood, I suppose). However, it just doesn't work. When I enter https://github.com/Alamofire/Alamofire.git in the search bar, it just doesn't find anything. My GitHub account is connected, but that shouldn't matter I guess.