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Can't `ghcup upgrade` to GHCup-0.1.18.0

The GHCup-0.1.18.0 release was just announced, with the instructions to type ghcup upgrade to upgrade to it. However, ghcup upgrade tells me that I am already at the latest version, which is incorrect:

$ ghcup --version
The GHCup Haskell installer, version 0.1.17

$ ghcup upgrade
[ Info  ] Upgrading GHCup...
[ Warn  ] No GHCup update available

I am on macOS-10.13.1, and I did not install ghcup with brew.

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