[Standard] Japan Open Chain - Nethermind v1.39.3

Scheduled for Aug 13, 14:00 - 20:00 UTC

Scheduled

We are upgrading our Japan Open Chain infrastructure to Nethermind v1.39.3.

This is a mandatory patch release that includes reliability and hardening fixes across block processing, networking, and request decoding.

The upgrade hardens ABI decoding against malformed input, fixes memory cleanup issues in block processing and networking, and optimizes allocations in EIP-6110 deposit-request decoding.

During the maintenance window, brief interruptions to RPC availability may occur.

https://github.com/NethermindEth/nethermind/releases/tag/1.39.3

Posted Aug 07, 2026 - 15:34 UTC

This scheduled maintenance affects: JOC (Mainnet — JSON-RPC API, Mainnet — Websockets API, Mainnet — Streams, Mainnet — Webhooks).