Jello Upgrade - Celo Docs

Overview

The Jello upgrade for the Celo network enables OP Succinct Lite, a production-ready, zero-knowledge-powered fault proof system built in collaboration with OP Labs and Succinct.

Specifications

L1 Contract changes

The Jello upgrade included L1 contract changes. They have been been accepted by governance in CGP-265 and executed by the Celo Security Council.

Execution Layer changes

There’s no execution layer changes in the Jello upgrade.

Upgrade Timelines

The Jello upgrade activated on Mainnet and Celo Sepolia, with the activation process for each network occurring independently.

Network	Date & Time (UTC)	Upgrade transaction
Celo Sepolia	Wed, Nov 05 2025 11:16:00	`0x736deb757f4708eeafecc961f36e14f3711c1d9f944e45c933b666329743b31a`
Mainnet	Wed, Dec 10 2025 10:24:11	`0x5fb3f2225dd2ba91efe941d4c9151df120ab06f6611b7b494bdecc96ff84c44b`