Notices & Upgrades
This section lists network upgrade notices and configuration changes for Robinhood Chain.
- Node operators should monitor this page — some upgrades require you to update your node before a scheduled activation.
- Developers should review notices for any behavior changes that could affect contracts or integrations.
- End users generally don't need to take action.
How network upgrades work
Robinhood Chain runs Arbitrum Nitro and periodically upgrades its ArbOS version. These upgrades activate onchain at a scheduled time. Before each activation, node operators must run a compatible Nitro node version — an un-upgraded node stops cleanly at the upgrade block and resumes normally once updated, with no data loss or resync required. Most upgrades require no action from dApp developers or end users, though some include EVM or behavior changes worth reviewing.
Notices
| Date | Version | Type | Description | Action Required |
|---|---|---|---|---|
| 2026-09-22 | N/A | Feed Change | A delayed backup sequencer feed is now available at wss://delayed-feed.mainnet.chain.robinhood.com. It runs ~500ms behind the primary feed (400–600ms in practice) on separate, hardened capacity. The public feed (wss://feed.mainnet.chain.robinhood.com) is unchanged and still real-time, but is best-effort with no uptime guarantee. The delayed feed is the supported fallback if the public feed degrades. | Recommended for node operators. Add the delayed endpoint as a second --node.feed.input.url entry alongside the primary feed. Your node deduplicates by sequence number — no added latency in normal operation. Alternatively, set it as --node.feed.input.secondary-url for strict standby mode. See the Arbitrum docs for trade-offs. |
| 2026-09-17 | N/A | Feed Change | The Robinhood Chain websocket feed is moving to compressed-only transmission using the RFC 7692 WebSocket per-message compression standard. This change takes effect September 17, 2026 on both Testnet and Mainnet. Nitro node operators and relay operators are unaffected. Custom scripts that read the feed directly must be updated or they will be unable to read the feed correctly. Note: Robinhood Chain cannot provide support for custom script implementations. | Custom script operators — action required. Recommended: connect a Nitro relay to the official feed and read uncompressed JSON from your relay. Alternatively, implement RFC 7692 per-message compression directly in your script. |
| 2026-09-14 | Nitro v3.11.4 | Node Software Upgrade | Nitro v3.11.4 is available on Docker Hub (offchainlabs/nitro-node:v3.11.4-7d5ac27-stripped). This is a node software release only — no chain consensus changes. Nodes on the current version will continue to sync normally. A full source release will follow in the coming business days. | Recommended — upgrade node operators to offchainlabs/nitro-node:v3.11.4-7d5ac27-stripped |