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On Monday, December 1, 2025 at 17:00 UTC, ArbOS 51 will activate on the Arbitrum Sepolia chain.
Context:
ArbOS 51 is a follow-up to ArbOS 50 that fixes issues with the Pricing Framework. ArbOS 50 was previously activated on Sepolia, but the Gas Target & Pricing Framework changes remained disabled pending this fix. ArbOS 51 now completes that work.
Upstream governance items (ArbOS 50 + Gas Target & Pricing Framework) are being bundled into a single on-chain vote. Both components have passed Snapshot temperature checks, with the Tally vote expected to open on or around December 4, 2025
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