Circle Internet Financial is expanding its support for Sepolia test networks to enhance developer experiences with Circle's stablecoin protocols and platform services, encouraging a migration from the Goerli test networks, which will no longer be maintained by the community. The transition involves launching USDC and EURC on Sepolia test networks for Arbitrum, Base, Ethereum, and OP, while Circle Mint and Faucet support will shift from Goerli to Sepolia. This migration, set for January 8-19, 2024, will include some downtime for the Circle Mint Sandbox APIs. As part of this change, Circle will deprecate support for Ethereum Goerli by the end of January 2024, affecting programmable wallets and smart contract platforms. Developers are urged to use Sepolia test networks, with historical transfers and balances remaining unaffected. Circle invites developers to join their Discord and use their developer portal for more information and updates.