> ## 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.

# Celo Sepolia Testnet Launch

Celo Sepolia is a new developer testnet that will replace Alfajores when Holesky sunsets in September 2025. The Baklava testnet will also sunset with Holesky, with no replacement planned.

<Note>
  **Key Information**

  This page will be kept updated with key information about the transition.

  * **Chain ID**: 11142220
  * **Status**: testnet live
  * **Built on**: Ethereum Sepolia L1
  * **Phases**:
    * Jul 23, 2025: Celo Sepolia launch ✅
    * Jul 24, 2025—Jul 31, 2025: Internal testing ✅
    * Aug 1, 2025—Aug 12, 2025: Early access phase ✅
    * Aug 13, 2025: Public announcement ✅
    * **Aug 14, 2025—Sep 14, 2025: Transition period :round\_pushpin:**
    * Sep 30, 2025: Planned Alfajores and Baklava sunset, aligned with Holesky deprecation

  **Node Providers**: Please support both Alfajores and Celo Sepolia during the transition period.

  **Developers**: Verify that your dependencies support Celo Sepolia, then go ahead and deploy all contracts.
</Note>

## What is Celo Sepolia?

Celo Sepolia is the new developer testnet for Celo running as an Ethereum Layer 2 on Sepolia. It starts with a clean slate (no inherited state from Alfajores) and is designed for long-term use following Ethereum Sepolia's testnet lifecycle.

## Call to Action

### For Node Providers

Please support both Alfajores and Celo Sepolia in parallel during the early access and transition phases to ensure a smooth migration for developers. See the [node setup guide](/infra-partners/operators/run-node) for technical details and our recommended [Docker Compose Setup](https://github.com/celo-org/celo-l2-node-docker-compose).

Release 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)

### For Developers

* Update applications to support chain ID 11142220.
* Redeploy contracts on Celo Sepolia.
* Get testnet CELO tokens from the faucets.

Since Celo Sepolia starts with a clean slate, there is no historical data or contracts carried over from Alfajores, providing a pristine testing environment.

## Key Characteristics and Resources

* Chain ID: 11142220
* L1 Foundation: Ethereum Sepolia
* EigenDA: v2 (Blazar)
* Contracts: [see the L1 and L2 contracts in the specification](https://specs.celo.org/core_contracts.html?#celo-sepolia-testnet)
* RPC endpoint: [Celo Sepolia Forno](https://forno.celo-sepolia.celo-testnet.org)
* Block explorer: [Blockscout](https://celo-sepolia.blockscout.com)
* Faucets:
  * [Google Cloud Web3 Faucet](https://cloud.google.com/application/web3/faucet/celo/sepolia)
  * [Celo Sepolia Token Faucet](https://faucet.celo.org/celo-sepolia)
* Bridge: [Superbridge for Celo Sepolia](https://testnets.superbridge.app/?fromChainId=11155111\&toChainId=11142220)

## Key Differences from Alfajores

| Aspect        | Alfajores                    | Celo Sepolia      |
| ------------- | ---------------------------- | ----------------- |
| L1 Foundation | Ethereum Holesky             | Ethereum Sepolia  |
| Chain ID      | 44787                        | 11142220          |
| State         | Historical from L1 migration | Fresh start       |
| Longevity     | Sunset planned Sept 2025     | Long-term testnet |

## Early Adopters

Thank you to the first wave of our ecosystem partners supporting Celo Sepolia already:

* **Google Cloud** – [Google Cloud Web3 Faucet](https://cloud.google.com/application/web3/faucet/celo/sepolia)
* **Blockscout** – [Block Explorer](https://celo-sepolia.blockscout.com/)
* **EigenDA v2** – Data Availability
* **Superbridge** – Bridging Infrastructure
* **Ankr** – Node & RPC Provider
* **AllThatNode by DSRV** – Node & RPC Provider
* **Redstone** – Oracle Services
* **Talent Protocol** – Web3 Professional Network
* **Prosperity Pass** – Celo PG Onchain Access Pass

## Getting Help

Please reach out to our team on [Discord](https://chat.celo.org) in the [#celo-L2-support](https://discord.com/channels/600834479145353243/1286649605798367252) channel if you have any questions.