The Package Manager will lock the Git package to a specific revision in your project.

This is to render the resolution of your project dependencies deterministic.

It is a mechanism to protect users against out of scope changes that could break your project.

To update the project to a different revision, you have two choices.

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1) Re-add the Git package URL in your project through the Package Manager UI

2) Open the project manifest (Packages/manifest.json) in a text editor, erase the entry for your package in the lock section.

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Hope this helps