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.