⚠️ Do not use v1.16.6 for the Fusaka upgrade! Please use v1.16.7, which contains an important security fix. ⚠️

This release enables the Fusaka hardfork on Ethereum mainnet The fork is scheduled to occur at 2025-12-03 21:49:11 UTC. This release also enables the BPO1 and BPO2 forks for mainnet at 2025-12-09 and 2026-01-07 respectively.

Fusaka

• Set mainnet timestamps for Osaka (#33063)
• Enable Fusaka for geth --dev mode (#32917)

RPC

• Add eth_sendRawTransactionSync which waits until either a timeout or the transaction is mined. This feature is mostly useful on L2s with lower blocktimes. (#32830, #32930, #32929)
• Add support for eth_simulateV1 in ethclient (#32856)
• Fix for an issue that might crash debug_traceCall (#33015)
• Fix for an issuer where local transactions were not persisted to the journal (#32921)

Core

• Add geth --genesis flag as an alternative to running geth init genesis.json (#32844)
• Fix for receipt insertion during ERA file import. (#32934)
• Work on getting the trie node history in order to serve historical eth_getProof request with the new path-based archive node. (#32907, #32914, #32937)
• Further work on cmd/keeper, our guest program for zkVMs (#32816)
• Various optimizations (#32971, #32916, #32965, #32946)

Networking

• New metrics for tracking slow peers (#32964)
• Fix for an issue where disconnected peers were not removed in txFetcher (#32947)

For a full rundown of the changes please consult the Geth 1.16.6 release milestone.

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As with all our previous releases, you can find the:

• Pre-built binaries for all platforms on our downloads page.
• Docker images published under ethereum/client-go.
• Ubuntu packages in our Launchpad PPA repository.
• OSX packages in our Homebrew Tap repository.