Synced from ethereum/EIPs @ 41a838d · 2026-10-19 13:31 UTC

Network upgrade · static membership

London

Mainnet

5 Aug 2021

shipped

Core EIPs

5

shipped

Track mix

Across all listed Core EIPs, every stage.

Included EIPs

5

EIP-1559Fee market change for ETH 1.0 chainFinalSplurge
EIP-3198BASEFEE opcodeFinalSplurge
EIP-3529Reduction in refundsFinalPurge
EIP-3541Reject new contract code starting with the 0xEF byteFinalSplurge
EIP-3554Difficulty Bomb Delay to December 2021FinalLegacy PoW

Activation

Network	Epoch	Timestamp	Time (UTC)	Fork ID
Mainnet	—	1628121600	5 Aug 2021 00:00 UTC	—

Pre-Dencun upgrades carry the mainnet date only.