What is the Ethereum L1 Fusaka upgrade
The Fusaka hardfork contains various breaking changes on the L1. See EIP-7607: Hardfork Meta - Fusaka for more info.
Important dates
- Ethereum Sepolia Fusaka hard fork: Tuesday, October 14th, 2025 07:36:00 UTC, affects Celo Sepolia testnet.
- Ethereum Mainnet Fusaka hard fork: Expected early December 2025, affects Celo Mainnet. We will update this notice with the exact date, and new software releases, once it is confirmed
As Celo relies on Ethereum L1, node operators must make sure to provide a Fusaka compatible L1 node access for the Celo client.
For Celo users, there are no changes expected from the L1 Fusaka upgrade.
Call to Action
For Node Operators
L1 Ethereum clients
You need to make sure that your L1 nodes are updated to a compatible version. Check the Ethereum Client release list for compatible versions.
L2 Celo client
There are no upgrades required for the Celo L2 client for the L1 Fusaka upgrade. We recommend the latest released versions:
Getting Help
Please reach out to our team on Discord in the #celo-L2-support channel if you have any questions.
