Holocene

Hardfork registry entry for the Holocene network upgrade, which introduced stricter derivation and dynamic EIP-1559 parameters.

Holocene reworked derivation rules and made EIP-1559 fee parameters configurable by chain operators.

Status	Active
Governing spec	specs.optimism.io
Governance approval	proposal
Operator notice	View notice
Mainnet activation (superchain default)	Thu, 09 Jan 2025 18:00:01 UTC (1736445601)
Sepolia activation (superchain default)	Tue, 26 Nov 2024 15:00:00 UTC (1732633200)

Minimum component versions (from Holocene notice):

Component	Minimum version
op-node	v1.10.2
op-geth	v1.101411.4

What changed

Per the spec overview:

• Execution layer: dynamic EIP-1559 parameters.
• Consensus layer: Holocene derivation.
• Smart contracts: SystemConfig updates.

The Holocene notice covers the operator steps that accompanied activation, including the L1 contract upgrades.