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This page outlines changes related to the Jello Upgrade for node operators.
This page will be kept updated with key information about the upgrade. As this upgrade is activated via a smart contract switch, no concrete activation time can be given.
  • Celo Sepolia testnet activation was executed on Wed, Oct 5, 2025.
  • Mainnet activation is planned for mid-November, 2025.

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What is the Jello Hardfork?

The Jello Hardfork enables OP Succinct Lite, a production-ready, zero-knowledge-powered fault proof system built in collaboration with OP Labs and Succinct. Key benefits include:
  • ZK-powered dispute resolution, reducing latency, cost and complexity in the dispute process
  • Improved infrastructure security through bond-based incentives and proof verification
  • Support for alternative DA layers, aligning with Celo’s modular roadmap
Succinct’s architecture is built on Optimism’s Kona execution engine, Succinct’s high-performance zkVM (SP1), and the Succinct Prover Network.

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For Node Operators

Node operators do not need to do any upgrades of the Celo client software for this Upgrade. We recommend the latest released versions:
Docker ComposeThe required configuration for each service can be found in our Docker Compose Setup, where every network has a corresponding <network>.env file.