Forcing all assets to serialize?

I regularly have assets that haven’t been changed since my last unity version upgrade. When I make a tiny change in one of them, it triggers a reserialization that has a huge diff instead of just the tiny one I expected. How can I force all assets to reserialize with the current unity version, so that my “real” diffs stay small and isolated? I’m fine with an asset store plugin, I just want to be able to make a single commit to contain all the version upgrading mess in one place and one time.