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This page outlines changes related to the Jello Upgrade for node operators.
Jello has been successfully activated.
  • Celo Sepolia testnet activation was executed on Wed, Nov 5, 2025.
  • Mainnet activation was executed on Wed, Dec 10, 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 did not need to upgrade the Celo client software for this upgrade. The Celo client versions recommended at the time were op-geth v2.1.2, op-node v2.1.0 and eigenda-proxy v1.8.2. For current versions see Network config.
Docker ComposeThe required configuration for each service can be found in our Docker Compose Setup, where every network has a corresponding <network>.env file.