Kingfisher: Update new image not work

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Issue Description

I have an avatar and want to update it, after I upload a new image and get a new URL, then the setImage function still gives me the old one. This code is triggered whenever it has a new URL.

let url = URL(string: profile.avatar60 ?? "")
avatarImageView.kf.setImage(with: url, placeholder: #imageLiteral(resourceName: "ic_profile_default"), options: [.transition(ImageTransition.fade(0.5))])

Then I cheat with this way to work (but some time it does not work)

DispatchQueue.main.asyncAfter(deadline: .now() + 0.5, execute: {
      let url = URL(string: profile.avatar60 ?? "")
      me.avatarImageView.kf.setImage(with: url, placeholder: #imageLiteral(resourceName: "ic_profile_default"), options: [.forceRefresh, .transition(ImageTransition.fade(0.5))])
})

So what is the exactly problem?