This is a re-roll of v1.16.6, including an important fix in the KZG cryptography library.

This release enables the Fusaka hardfork on Ethereum mainnet.

The Fusaka fork is scheduled to occur at 2025-12-03 21:49:11 UTC. Please upgrade your node to v1.16.7 in time for the fork.

This release also enables two blob-parameter-only (BPO) upgrades. These upgrades change protocol parameters to increase the available blob capacity.

• BPO1 on2025-12-09
• BPO2 on 2026-01-07

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

• Fix for a cryptographic vulnerability in c-kzg-4844. This is only exploitable post-Fusaka. (#33093)
• 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 and 1.16.7 release milestones.

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 (use "stable" tag).
• Ubuntu packages in our Launchpad PPA repository.
• macOS packages in our Homebrew Tap repository.