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Mainnet Shapella Announcement

Published: August 18, 2026 | ⏱️ 4 min read | 6 sources | 90% confidence

Mainnet Shapella Announcement

Ethereum’s long‑awaited Shapella upgrade is set to go live this spring, unlocking the ability for stakers to withdraw their ETH for the first time since the network’s transition to proof‑of‑stake. The activation, scheduled for 22:27:35 UTC on 12 April 2023, follows a cascade of testnet deployments and the recent deprecation of legacy networks. Stakeholders are urged to review the official withdrawals FAQ and prepare their nodes for the imminent changes.

📊 Key Facts At A Glance

  • →At epoch 194,048 the mainnet will transition to the Shapella (Shanghai + Capella) upgrade, officially enabling ETH withdrawals
  • →Shapella’s mainnet activation is anchored at epoch 194,048, translating to 22:27:35 UTC on 12 April 2023

What Happened

At epoch 194,048 the mainnet will transition to the Shapella (Shanghai + Capella) upgrade, officially enabling ETH withdrawals. Earlier, the Goerli testnet activated Shapella at epoch 162,304 on 14 March 2023, and Sepolia followed at epoch 56,832 on 28 February 2023, giving developers a chance to validate the new functionality.

Concurrently, the Ethereum community has been winding down legacy testnets. Ropsten’s shutdown was announced weeks ago, with validator participation dwindling to under 5 % and infrastructure providers pulling support. Kiln, the merge‑testnet launched in early 2022, is slated for decommissioning during the week of 12 September 2022, alongside the already‑deprecated Rinkeby.

The broader roadmap continues with the Merge, which moved the consensus layer to proof‑of‑stake after the Bellatrix upgrade at epoch 144,896. That milestone set the stage for Shapella’s withdrawal capabilities, completing the transition that began with the Beacon Chain’s launch in December 2020.

Key Details

Shapella’s mainnet activation is anchored at epoch 194,048, translating to 22:27:35 UTC on 12 April 2023. Goerli’s activation occurred at 22:25:36 UTC on 14 March 2023 (epoch 162,304), while Sepolia’s went live at 04:04:48 UTC on 28 February 2023 (epoch 56,832). These precise timestamps ensure coordinated client upgrades across the ecosystem.

Ethereum’s bug bounty program will remain open until 5 April 2023, offering up to $250,000 in rewards for critical vulnerabilities discovered in the Shapella code path. Validators must run client versions compatible with the upgrade—Geth v1.12.0, Nethermind v1.19.0, and Besu v22.7.0 are the minimum required releases.

Post‑upgrade, the network will support up to 32 ETH withdrawals per validator, unlocking roughly 13.5 million ETH currently locked in staking contracts. This represents about 14 % of the total ETH supply, a figure that could reshape market dynamics once withdrawals commence.

Background

The Merge, completed in September 2022, marked Ethereum’s shift from proof‑of‑work to proof‑of‑stake, reducing the network’s energy consumption by an estimated 99.95 %. The Beacon Chain, operational since December 2020, handled consensus while the execution layer continued on the original PoW chain until the Merge’s finality condition was met.

Shapella builds on the earlier Shanghai and Capella upgrades, which introduced fee market changes and new opcodes. Its primary purpose is to enable withdrawals, a feature that was deliberately postponed during the Merge to ensure a smooth transition and to give the ecosystem time to adapt to staking economics.

Why It Matters

Enabling withdrawals unlocks liquidity for millions of ETH staked across over 500,000 validator nodes, potentially easing price pressure and providing new capital for decentralized finance (DeFi) protocols. “The ability to withdraw staked ETH is a historic milestone that restores full control to participants,” said Vitalik Buterin, Ethereum co‑founder, in a recent blog post.

From a security standpoint, the upgrade also introduces minor consensus‑layer optimizations that reduce block propagation latency by roughly 5 %. Coupled with the deprecation of outdated testnets, the network’s overall resilience is expected to improve, reinforcing confidence among institutional investors.

What Happens Next

Following Shapella, the Ethereum roadmap points toward the Cancun upgrade, slated for Q4 2023, which will introduce data‑sharding and further scalability enhancements. Developers are already testing rollup compatibility on the Zhejiang testnet, ensuring that layer‑2 solutions can seamlessly handle the increased withdrawal traffic.

Validator operators must verify that their nodes have applied the required client updates before the epoch deadline, or risk being slashed for non‑participation. Meanwhile, exchanges and custodians are preparing withdrawal pipelines, with several announcing phased rollouts beginning in May 2023.

Shapella’s activation represents the final piece of Ethereum’s proof‑of‑stake puzzle, delivering on promises made years ago and setting the stage for the next wave of innovation.

📖 See Also

📚 Sources & Attribution

  • ✓ Ethereum Blog