Ethereum will stop supporting the Holesky testnet by September 2025 due to issues with validator exits and network stability.The new Hoodi test network will take over Pectra upgrade testing, with activation planned for March 26, 2025.Holesky testnet is being shut down due to problems with validator exits and network stability during Pectra upgrade testing.Hoodi testnet has been launched as a replacement for Holesky for smooth transition to the Pectra upgrade.