Affected components
Arbitrum - Mainnets
Updates
Complete
Ethereum finalized the fork block correctly, all the rollups are operating normally.
Wed, Dec 3, 2025, 10:21 PM
In progress
Maintenance has started
Wed, Dec 3, 2025, 07:00 PM(3 hours earlier)
Scheduled
Activation Time: 2025-12-03 21:49:11 UTC
The Fusaka upgrade will activate on Ethereum Mainnet L1 at the time above.
Action required:
If you or your partners operate an external node for your network, you must upgrade nitro to the version 3.9.2 or above as specified in the official notice below:
https://docs.arbitrum.io/notices/fusaka-upgrade-notice#for-node-operators
Nodes not upgraded correctly will stop syncing after activation.
No action required if you:
Use Conduit RPC directly
Reach-out Conduit Support Team if you encounter any issue.
Fri, Nov 21, 2025, 11:35 AM(1 week earlier)