Arbitrum Sepolia node operators must upgrade to Nitro v3.9.3 before the ArbOS 51 (Fusaka) network upgrade on ArbSepolia, scheduled for November 20, 2025, at 17:00 UTC (12:00 PM ET).
This release is available as a Docker Image on Docker Hub at offchainlabs/nitro-node:v3.9.3-rc.1-8bc5554
This Docker image specifies default flags in its entrypoint which should be replicated if you're overriding the entrypoint: /usr/local/bin/nitro --validation.wasm.allowed-wasm-module-roots /home/user/nitro-legacy/machines,/home/user/target/machines
If you're running a validator without a split validation server (this will be true of most validators), you should instead use the image offchainlabs/nitro-node:v3.9.3-rc.1-8bc5554-validator which has the extra script /usr/local/bin/split-val-entry.sh as the entrypoint (no need to override the default entrypoint).
What's Changed
Support for ArbOS51
User-facing Changes
- Fix retryable gas calculation bug and add ArbOS51 version (#4047): #4068
- Add support for ArbOS51: #4073
Internal Highlights
- stop block metdata fetcher when node stops: #4021
Full Changelog: v3.9.2...v3.9.3-rc.1