Arbitrum has rolled out ArbOS 61, nicknamed “Elara,” bringing new developer tools and enterprise-focused options to its growing ecosystem. The upgrade went live on August 20 and requires node operators to update to Nitro v3.11.3. Key changes - Optional protocol-level compliance filtering for Orbit chains — aimed at private or enterprise deployments, not a blanket change for public Arbitrum One or Nova networks. - Stylus contract size increased from 24 KB to 96 KB, giving developers much more room for complex contracts. - General enhancements that continue Arbitrum’s push to support customizable, Ethereum-compatible chains. What this means Arbitrum is no longer just a single L2. Alongside Arbitrum One and Nova, the Orbit framework lets teams spin up bespoke chains using Arbitrum tech. Elara’s additions reflect that shift: it’s focused on giving builders and enterprise operators the tools to tailor chains for specific compliance, performance, privacy, or operational needs. The new compliance filter is the most headline-grabbing feature and will likely split opinion. For institutional or regulated users — tokenized assets, private ledgers, or compliance-heavy workflows — protocol-level filtering can be a practical necessity. For crypto purists, any protocol-level filtering raises concerns about censorship. Crucially, Arbitrum frames this as optional and configurable for Orbit chain operators, not a change imposed on public networks like Arbitrum One or Nova. Why the Stylus increase matters Stylus lets developers write smart contracts in languages beyond Solidity (including Rust, C, and C++). Boosting the contract size cap from 24 KB to 96 KB makes Stylus more practical for larger applications and smoother migrations of heavier codebases, strengthening Arbitrum’s developer-facing tooling. Broader implications Elara pushes Arbitrum further into the “rollup-as-a-service” and enterprise L3 space by offering customization without forcing uniform rules across its public networks. The upgrade tests whether demand for enterprise features — compliance tooling, permissioning, custom gas models, privacy options — will translate into more Orbit chain deployments. If uptake is strong, Elara could bolster Arbitrum’s position for teams that need controlled, compliant, Ethereum-aligned infrastructure. If not, the developer improvements may be the lasting benefit. Source This report is based on Arbitrum and Offchain Labs materials about the ArbOS 61 “Elara” upgrade. Written by the News Desk; edited by Samuel Rae.
Arbitrum Launches ArbOS 61 'Elara' with Optional Compliance Tools and 4x Stylus Contract Size
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Summary
Arbitrum has rolled out a protocol update, ArbOS 61 'Elara,' adding optional crypto compliance tools for Orbit chains and expanding Stylus contract size to 96 KB. The upgrade, live since August 20, requires node operators to run Nitro v3.11.3. Compliance features are optional and target private or enterprise use, not public chains like Arbitrum One. The Stylus change gives developers more room for complex logic and non-Solidity languages. The protocol update supports Arbitrum’s push toward flexible, Ethereum-compatible chains and enterprise L3 solutions.
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