Key Notes

Holesky testnet served developers for two years, enabling thousands of validators to test protocol upgrades successfully.

Critical downtime during Pectra testing in early 2025 exposed smart contract address issues, prompting infrastructure changes.

Developers have two weeks post-Fusaka launch in November to migrate from Holesky to supported testnets like Hoodi and Sepolia.

The Ethereum Foundation announced on Sept. 1 that the Holesky testnet will shut down in the coming weeks as it reaches its planned sunset date ahead of the impending “Fusaka” network upgrade.

Holesky was launched back in Sept. 2023 to allow developers a safe environment to roll out upgraded features and services on the Ethereum blockchain network. During its two-year tenure, it was primarily used to tes

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