Jovian

Hardfork registry entry for the Jovian network upgrade, which introduced the minimum base fee and DA footprint limit.

Jovian introduced fee-market and data-availability controls for chain operators.

Status	Active
Governing spec	specs.optimism.io
Governance approval	proposal
Operator notice	Upgrade 17 notice
Mainnet activation (superchain default)	Tue, 02 Dec 2025 16:00:01 UTC (1764691201)
Sepolia activation (superchain default)	Wed, 19 Nov 2025 16:00:01 UTC (1763568001)

Minimum component versions (from Upgrade 17 notice):

Component	Minimum version
op-node	v1.16.2
op-batcher	v1.16.2
op-geth	v1.101603.5
op-challenger	v1.7.0
kona-node	v1.2.4
op-reth	v1.9.2

What changed

Per the spec overview:

• Execution layer: minimum base fee, DA footprint limit, and operator fee changes.
• Consensus layer: network upgrade transactions applied during derivation; auto-upgrade and extension of the L1Block (L1 attributes) predeploy.
• Smart contracts: SystemConfig updates.

The Upgrade 17 notice covers the operator steps that accompanied activation.