Jovian Upgrade

Table of Contents

• Overview
• Specifications
  • Optimism Jovian Features
  • Celo-Specific Changes
    • Transfer Precompile Address Warming
    • Minimum Base Fee
• Upgrade Timelines

Warning

The Celo Jovian hardfork is still being worked on. This information is preliminary.

Overview

The Jovian upgrade for the Celo network adopts features from Optimism’s Jovian hardfork, along with Celo-specific improvements to the transfer precompile and gas pricing mechanism.

Specifications

The Celo Jovian upgrade brings in consensus and execution changes from Optimism’s Jovian hardfork. For full technical details, see the Optimism documentation linked below.

• Optimism’s Jovian Upgrade Notice

Optimism Jovian Features

• Cannon Go 1.24 Support: The on-chain fault proof virtual machine implementation is upgraded to support Go 1.24.
• Configurable Minimum Base Fee: Allows chain operators to specify a minimum base fee to shorten the length of priority fee auctions (disabled by default).
• Data Availability Footprint Block Limit: An in-protocol limit on estimated DA usage prevents spam and priority fee auctions. The blobGasUsed property now stores DA footprint values instead of remaining zero. Celo does not make use of this feature.

Celo-Specific Changes

Transfer Precompile Address Warming

The transfer precompile now warms the from and to addresses during execution. This aligns with standard EVM behavior where address accesses during value transfers are warmed, ensuring correct gas accounting for subsequent operations on the same address.

Related implementation:

• op-geth #433
• op-geth #435 (tracing improvements)
• celo-kona #115

Minimum Base Fee

Celo transitions from its Celo-specific gas price floor mechanism to Optimism’s Minimum Base Fee. This aligns Celo’s gas pricing with the OP Stack standard while maintaining the ability to set a floor on transaction costs.

Related implementation:

• op-geth #445

Upgrade Timelines

The Jovian upgrade is scheduled for activation on the Mainnet, Alfajores, and Baklava, with the activation process for each network occurring independently.