Unmaintained Scrivener HTML don't let me do upgrade to phoenix 1.5

While using a forked version is what I would generally recommend here (providing the changes are good), you actually want to do the opposite of what you tried. And instead use:
{:phoenix, "~> 1.5", override: true}
Because you are overriding the dependency requirements for phoenix (and not ignoring the requirements of :scrinever_html). However, if you do this then you need to manually check that no other dependency is incompatible with the specific version of phoenix that you are using.

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