> ## Documentation Index
> Fetch the complete documentation index at: https://docs.celo.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Jello Hardfork: OP Succinct Lite Integration

This page outlines changes related to the Jello Upgrade for node operators.

<Note>
  Jello has been successfully activated.

  * Celo Sepolia testnet activation [was executed](https://eth-sepolia.blockscout.com/tx/0x736deb757f4708eeafecc961f36e14f3711c1d9f944e45c933b666329743b31a) on Wed, Oct 5, 2025.
  * **Mainnet** activation [was executed](https://eth.blockscout.com/tx/0x5fb3f2225dd2ba91efe941d4c9151df120ab06f6611b7b494bdecc96ff84c44b) on Wed, Dec 10, 2025.
</Note>

## 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.

## 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:

* `op-geth` at [v2.1.2](https://github.com/celo-org/op-geth/releases/tag/celo-v2.1.2)
* `op-node` at [v2.1.0](https://github.com/celo-org/optimism/releases/tag/celo-v2.1.0)
* `eigenda-proxy` at [v1.8.2](https://github.com/layr-labs/eigenda/pkgs/container/eigenda-proxy/437919973?tag=v1.8.2)

<Tip>
  **Docker Compose**

  The required configuration for each service can be found in our [Docker Compose Setup](https://github.com/celo-org/celo-l2-node-docker-compose), where every network has a corresponding `<network>.env` file.
</Tip>