Optimism: Superchain 16a upgrade is scheduled to be deployed to the mainnet on October 2, pending governance approval.

Optimism stated on the X platform that the Superchain 16a upgrade proposal will be submitted for implementation soon after governance approval: deployment to Superchain Sepolia on September 22 and to the Superchain mainnet on October 2. This is a maintenance upgrade that will replace U16 with a safer and more flexible approach.