Uniswap smart contracts do not have an admin key and are not upgradeable. There is no mechanism available to modify or upgrade Uniswap's smart contracts. Please note that funds deposited on Uniswap still inherit the risk of the token itself, which may still entail admin key risk.
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Uniswap is the most trustless DeFi protocol/product currently available. There is no possible way to upgrade, modify, or stop Uniswap's smart contracts.