The ArbOS 40 upgrade aligns Arbitrum with Pectra, Ethereum’s mainnet hard fork activated on May 7, 2025, at epoch 364032.
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Ethereum’s Pectra Hits Arbitrum: A Quiet Shift With Big Implications
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The Ethereum Pectra hard fork was activated on the Ethereum mainnet on May 7, 2025, at epoch 364032 and the ArbOS 40 upgrade on Arbitrum was specifically designed to align the Layer-2 network with this mainnet protocol upgrade
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