Ethereum developers agreed on Feb. 28 as the target date for pushing the Sepolia test network (testnet) through the Shanghai upgrade, the blockchain’s big upcoming move to allow withdrawals of staked ether (ETH).

Sepolia, a closed testnet for the Ethereum developers only, is the second such network to undergo the upgrade. Earlier this week, the Zhejiang testnet ran its own successful simulation of staked ETH withdrawals. There’s one more test network set to get the upgrade, and then the main Ethereum blockchain is expected to undergo the so-called Shanghai hard fork next month.

The Sepolia testnet is closed to developers who run validators on the network. By contrast, Zhejiang is a public testnet, meaning that it was open to anyone, including staking providers, who wanted to practice the release of staked ETH.