Optimism Documentation

Normative spec: the Holocene specification is the canonical definition of this upgrade. This page records activation data and operational pointers; it does not restate the spec.

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.

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Holocene

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What changed