Ethereum's next upgrade removes the 21,000 gas rule wallets depend on

Ethereum's upcoming upgrade, Glamsterdam, will change how transfers are charged, breaking software built on the assumption that every ETH transfer costs exactly 21,000 gas. Wallets and blockchain services treating that figure as both floor and ceiling may reject valid payments or underquote fees. The change reflects that paying an existing account costs less work than creating a new address record. The upgrade activates Thursday on Platåberget, a testnet using worthless tokens, then Sepolia and Hoodi, before mainnet. Ordinary users need not act; the warning targets companies building wallet software.

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