# Goerli to Sepolia: Evolving Base’s Testnet Infrastructure

By [Base](https://blog.base.org) · 2023-10-18

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Base is moving our test network from Goerli to Sepolia. This shift isn't just a technical move; it's a stride toward creating a more unified ecosystem.

**Why the Move to Sepolia?**

*   **Walking Hand in Hand with Optimism:** As both Optimism and Base have a shared vision for a superchain future, moving to Sepolia created a more unified ecosystem.
    
*   **Fostering App Development:** Sepolia's environment is tailored for app development, aligning with the core purpose of our testnet.
    

**Goodbye Goerli, Welcome Sepolia**

*   Base Goerli and Sepolia will co-exist from mid-October until **_January 2024_**. At that point, Sepolia will become our singular testnet.
    

We're excited about the fresh opportunities this testnet change brings to the table. The move to Sepolia marks a significant milestone in our pursuit of a more harmonized ecosystem, offering new avenues for cooperation with Optimism, app developers, and our entire builder community.

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*Originally published on [Base](https://blog.base.org/goerli-to-sepolia-evolving-bases-testnet-infrastructure)*