History
Activation Time: 2025-10-14 07:36:00 UTC
The Fusaka upgrade will activate on Ethereum Sepolia L1 at the time above.
Action required:
If you or your partners operate an external Agglayer CDK L2 testnet node, you must upgrade op-node and op-geth to the versions specified in the official notice:
https://docs.optimism.io/notices/fusaka-notice#for-node-operators
Nodes not upgraded correctly will stop syncing after activation.
No action required if you:
Use Conduit RPC directly, or
Operate a Base L3 chain.
Reach-out Conduit Support Team if you encounter any issue.
Activation Time: 2025-10-14 07:36:00 UTC
The Fusaka upgrade will activate on Ethereum Sepolia L1 at the time above.
Action required:
If you or your partners operate an external Arbitrum Stack L2 testnet node using ETHDA 4844 Blobs, you must upgrade nitro to the versions specified in the official notice:
https://arbitrum.notion.site/EXT-Comms-Actions-Required-For-L2-Nitro-Node-Operators-Before-L1-Sepolia-Mainnet-Fusaka-Upgrade-28601a3f59f880feb846c203d8480e73
Nodes not upgraded correctly will stop syncing after activation.
No action required if you:
Use Conduit RPC directly, or
Operate a Base/Arbitrum L3 or L2 with AnyTrust chain.
Reach-out Conduit Support Team if you encounter any issue.
Activation Time: 2025-10-14 07:36:00 UTC
The Fusaka upgrade will activate on Ethereum Sepolia L1 at the time above.
Action required:
If you or your partners operate an external OP L2 testnet node, you must upgrade op-node and op-geth to the versions specified in the official notice:
https://docs.optimism.io/notices/fusaka-notice#for-node-operators
Nodes not upgraded correctly will stop syncing after activation.
No action required if you:
Use Conduit RPC directly, or
Operate a Base L3 testnet - do not upgrade because the latest version does not support this configuration
Reach-out Conduit Support Team if you encounter any issue.