-This upgrade is proposed in response to security vulnerabilities identified during a series of third-party security audits by Spearbit, Cantina, and Code4rena. None of the vulnerabilities have been exploited, and user assets are not and were never at risk. However, out of an abundance of caution, the permissioned fallback mechanism has been activated in order to avoid any potential instability while the vulnerabilities are patched. For more information on the permissioned fallback mechanism and the OP Stack's defense-in-depth approach to Fault Proof security, see the [fault proof documentation](https://docs.optimism.io/stack/fault-proofs/fp-security).
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