Key Notes

Holešky testnet faced validator inactivity leaks and extended exit queues after completing the Pectra upgrade in May 2025.

The new Hoodi testnet replaces Holešky for validator testing while Sepolia handles smart contract development activities.

Ethereum's testing infrastructure now consists of three networks: Sepolia, Hoodi, and the 28-day resetting Ephemery testnet.

The Ethereum Foundation has initiated the planned shutdown of Holešky, a large-scale public testnet launched in 2023 for validation and protocol upgrade testing. The decision follows the completion of the Fusaka upgrade, which introduced PeerDAS , a feature designed to reduce validator bandwidth requirements and enhance scalability across layer-2 networks.

The Holešky testnet supported several critical upgrade

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