Skip to main content
Notices are time-bound action items for application developers, node operators, and chain operators: upcoming network upgrades, deprecations, and operational changes. Each hardfork also has a permanent entry in the hardfork registry recording its activation times, governing spec, and minimum component versions, and contract-only upgrades are listed in the registry’s contract upgrades table — notices are archived after activation, registry pages are forever.

​
Network upgrades

Upgrade 20

Prepare Fault Proof services for Super Root Dispute Games and other maintenance smart contract upgrades

Interop Activation Prep

OP Sepolia and Unichain Sepolia interop activation preparation

​
Operations

Specialized Node Topology

Guidance for Supernode and Light CL node topology

Subblocks: 200 ms interval and payload changes

A 200 ms subblock interval and four zeroed stream payload fields on OP Sepolia and OP Mainnet