Jovian Hardfork Live on Celo Sepolia - Coming to Mainnet

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Dear Celo community,

The Jovian hardfork is now live on Celo Sepolia.

This marks the next step toward Mainnet activation, which is scheduled for Tuesday, March 31, 2026 at 12:06:28 UTC (timestamp 1774958788).

Jovian brings Celo into alignment with the latest OP Stack upgrade path while introducing Celo-specific improvements around gas accounting, base fee handling, and infrastructure compatibility.

What’s Included in Jovian

The Jovian hardfork adopts features from Optimism’s Jovian upgrade alongside several Celo-specific improvements, including:

  • Transfer Precompile Address Warming to align with standard EVM behavior and improve gas accounting consistency
  • Minimum Base Fee Transition, moving from Celo’s custom gas price floor to Optimism’s configurable minimum base fee model
  • L1 Fusaka compatibility for improved alignment with the broader OP Stack ecosystem
  • EigenDA proxy upgrade to support the latest trustless integration and newer EigenDA protocol versions

For the full technical specification, see the Jovian upgrade documentation.

For Node Operators and Infrastructure Partners

Node operators, RPC providers, indexers, bridge providers, and other infrastructure partners should ensure they are upgraded ahead of mainnet activation.

The required releases include the activation timestamps for both networks:

Important: EigenDA Proxy Configuration Changes

Jovian increases the minimum EigenDA proxy version to v2.6.0, which requires configuration updates.

Set the following flags

  • --eigenda.v2.network → mainnet or sepolia_testnet
  • --eigenda.v2.cert-verifier-router-or-immutable-verifier-addr → set to the CertRouter contract on the corresponding L1:
    • Sepolia: 0xf4f934A0b5c09d302d9C6f60040754fEebdd6073
    • Mainnet: 0x2ea418AE1852bfC79e18B37E55F278F9c598AA08
  • --apis.enabled → op-generic,op-keccak,standard,metrics

Remove the following flags if currently set

  • --eigenda.signer-private-key-hex
  • --eigenda.v2.disperser-rpc
  • --eigenda.v2.cert-verifier-addr
  • --eigenda.v2.eigenda-directory
  • --eigenda.v2.signer-payment-key-hex
  • --eigenda.v2.service-manager-addr
  • --eigenda.v2.bls-operator-state-retriever-addr
  • --eigenda.g1-path
  • --eigenda.g2-path
  • --eigenda.g2-path-trailing

For Docker Compose users, reference configurations are available in the Celo L2 Docker Compose repository.

Verify Your Configuration

Ahead of mainnet activation, operators should verify:

  • op-node logs show the correct Jovian activation time
  • op-geth logs show the correct Jovian activation time
  • EigenDA proxy is updated to v2.6.0 with the required new flags

Questions

If you have any questions or need support during the upgrade process, please reply here or reach out in the usual channels.

The cLabs team

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