@@ -23,7 +23,8 @@ The following dates are relevant for Arbitrum chain operators.
2323
2424| Date | Network upgrade | Affected audience |
2525| ---------------------------------------- | ------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------------- |
26- | ` Nov 20th 2025, 17:00:00 UTC ` | Arbitrum Sepolia upgrade to [ ArbOS 51] ( docs/run-arbitrum-node/arbos-releases/arbos51.mdx ) | Node operators for Arbitrum Sepolia |
26+ | ` Nov 20th 2025, 17:00:00 UTC ` | Arbitrum Sepolia upgrade to ArbOS 50 | Node operators for Arbitrum Sepolia |
27+ | ` Dec 1st 2025, 17:00:00 UTC ` | Arbitrum Sepolia upgrade to [ ArbOS 51] ( docs/run-arbitrum-node/arbos-releases/arbos51.mdx ) | Node operators for Arbitrum Sepolia |
2728| ` Jan 8th, 2026, 17:00:00 UTC (proposed) ` | Arbitrum One/Nova upgrade to [ ArbOS 51] ( docs/run-arbitrum-node/arbos-releases/arbos51.mdx ) | Node operators for Arbitrum One/Nova |
2829| ` Oct 14th 2025, 07:36:00 UTC ` | Ethereum Sepolia Fusaka hard fork | Node operators for Arbitrum chains settling on Ethereum Sepolia (Orbit L2s, Arbitrum Sepolia) |
2930| ` Dec 3rd 2025, 21:49:11 UTC ` | Ethereum Mainnet Fusaka hard fork | Node operators for Arbitrum chains settling on Ethereum Mainnet (Orbit L2s, Arbitrum One/Nova) |
@@ -40,6 +41,12 @@ Outlined below are different types of Arbitrum chains, along with node software
4041| ** L3** | ** Rollup** | N/A | No nitro update required | Doesn't require historical blob data |
4142| ** L3** | ** AnyTrust / AltDA** | Enabled or Disabled | No nitro update required | Doesn't require historical blob data |
4243
44+ :::warning Exceptions
45+
46+ For batch posters settling to mainnet Ethereum, Nitro >=3.8.0 is required.
47+
48+ :::
49+
4350### How to ensure your node has access to all historical blob data and blob data from all subnets
4451
4552#### If you run a Nitro node and use an external L1 Ethereum beacon chain RPC:
0 commit comments