The Shanghai upgrade could start as early as October
On March 19th, Ethereum developers are currently discussing the prioritization of the Shanghai upgrade. One option is that the Shanghai upgrade will be launched as another feature fork, including EIP not included in the London upgrade; Another option would be to adopt Vitliak Buterin's quick merger proposal and upgrade Shanghai as ETH1. > The merge of Eth2. If the first option is adopted, and the Shanghai upgrade is launched as a functional fork, then it could be launched in October 2021. If it is the latter, it will be delayed to a much longer time.
It is understood that the Shanghai upgrade is the Ethereum hard fork upgrade following the London upgrade. The Shanghai upgrade may contain EIPs that did not make it to the London upgrade, as only a few changes will be made to the London upgrade (delaying difficulty bombs and EIP-1559) to minimize the complexity of the upgrade. The Shanghai upgrade to EIP may include either 3298 (eliminating gas refunds for SSTORE and SELFDESTRUCT) or 3322 (valid gas refunds). [Daily Planet]
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