OffchainLabs/nitro v3.10.1

Arbitrum Nitro v3.10.1

on GitHub

Important Note: Once a database is run with v3.10.x, the database cannot be used with v3.9.9.

This release is available as a Docker Image on Docker Hub at offchainlabs/nitro-node:v3.10.1-d7f07be
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\

Special note: On Monday, May 18, 2026 at 17:00 UTC, ArbOS 60 will activate on the Arbitrum Sepolia chain. Arbitrum Sepolia node operators must upgrade to Nitro v3.10 ahead of this activation to continue syncing the chain. This is not a required upgrade for Arbitrum One at this time, the date for Arbitrum One ArboOS upgrade has not been set yet.

Sepolia validators can use block-validator.pending-upgrade-module root="0x7a9e6a77354888257a9989ce0b6bb39df5fedf222d453932933fdf7a489cbb57" to validate against the planned arbos-60 upgrade

Important for any chains still on ArbOS40:

• 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:v3.10.1-d7f07be-validator which has the extra script /usr/local/bin/split-val-entry.sh as the default entrypoint (no need to override the default entrypoint). This will run both v3.10.0 and v3.7.6 validator workers for you.
• If you are using a split validator, you do not want to use -validator image, you need to run a validator worker on v3.7.6 as well as a worker for v3.10.1
• Arbitrum Chain SDK v0.25.2 (along with consensus_v51.1) is required for ArbOS51

Important for any chains that previously upgraded to ArbOS51 with consensus_v51:

• Validator should use configuration option --node.block-validator.pending-upgrade-module-root="" to avoid performing unnecessary work trying to validate consensus_v51.1.

v3.10.1 - 2026-05-12

Configuration

• Add --execution.legacy-zero-base-fee-until <unix-ts> opt-in compatibility flag (default 0 = disabled). When set, restores the pre-v3.7 behavior of treating headers with ArbOSFormatVersion <= 40 and BaseFee == 0 as non-arbitrum, for blocks with timestamp strictly less than the given value.

Added

• Include transaction-filterer binary in nitro-node and nitro-node-stripped Docker images.

Changed

• Set default EnableETHCallFilter to false.
• Update address-filter S3 hash list format
• Ensure genesis block is appropriately validated

Fixed

• Resolve BoLD Staking Bug That Attempts Self-Challenge