Ethereum Client Geth Releases v1.17.9 Ahead of Amsterdam Testnet Fork

Go-Ethereum developers published Geth v1.17.9, dubbed "Universal Semiconductor," scheduling the Amsterdam hard fork on the Hoodi testnet for Oct. 26, 2026 ¹. According to the release documentation, the upgrade activates at block timestamp 1,793,036,568 (17:42:48 UTC) ¹. Node operators running on the Hoodi network are advised to upgrade to the new client binary to maintain synchronization ¹. At the time of writing, $ETH traded at $2,510, up 3.0% over 24 hours.

Alongside the scheduled testnet upgrade, the v1.17.9 release introduces targeted execution performance gains for the Ethereum Virtual Machine (EVM) ¹. An inlined switch implementation accelerates EVM interpreter opcode dispatching by 16% ¹. Developers also shifted state history committing tasks to the background, cutting execution overhead for the newPayload consensus engine call by 2% ¹. Additionally, key-value database parameters were adjusted to enhance disk write performance, while the client's archive node functionality now supports a --history.transactions flag for configurable transaction index histories ¹.

Network Fixes and Consensus Compatibility

The update incorporates several resilience patches addressing data corruption risks and networking stability ¹. Geth developers resolved potential database corruption scenarios tied to power outages, a trie database bug involving concurrent state reads, and a block access list corruption issue caused by RPC calls running concurrently with block processing ¹. Networking changes resolve a snap/2 restart issue involving pivot block reorganizations in the header chain and patch a mempool corruption issue where priority tips dropped below the network base fee ¹.

On consensus compatibility, Geth's block synchronization layer now supports the Gloas beacon chain fork alongside multiple bug fixes ¹. Developers also adjusted JSON-RPC specifications, enforcing strict fork alignment for calls like eth_call, rejecting transactions under EIP-7702 with invalid yParity values, and refining eth_simulateV1 compliance ¹. Node operators can obtain the update through pre-built binaries, Docker containers, Ubuntu PPA packages, and Homebrew ¹.