Have 100k in HYSA @ 4%. Change?

We have 100k in a high-yield savings account. This is Have 6 figures in HYSA @ 4%. Change? our “ rainy day” account - in case our family business turns sour, big, unexpected purchases, etc. So we don’t plan on touching it, but would like to keep it low risk. Would you put it into something else? I’ve never purchased treasury bonds, but it looks like they have a higher yield than 4%? Any advice would be great!

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