Ethereum’s largest testnet, Holešky, will be shut down two weeks after the Fusaka upgrade is finalized on the network.

The Ethereum Foundation announced on Monday that the testnet had “reached its planned end-of-life date” and that it would no longer be supported by client, testing, or infrastructure teams after Fusaka goes live.

Holešky was launched in 2023 to test staking infrastructure and validator operations, and played a key role in testing major upgrades like Dencun and Pectra.

This story is an excerpt from the Unchained Daily newsletter.

But after validator inactivity and exit queues following the Pectra upgrade in early 2025, the Foundation decided to migrate testing to the newer Hoodi testnet in March for a cleaner, more stable testing environment.

Ethereum’s testnet structure now spans three testnets: Sepolia for decentralized apps (DApps) and smart contracts, Hoodi for staking, validators, and infrastructure testing, and Ephemery for transient testing without the state persistence concerns of longer-running testnets.