Ethereum Glamsterdam Upgrade: 7 Powerful Changes Coming to ETH 2026

The Ethereum Glamsterdam upgrade is the biggest planned change to the network since the Merge, and it has just reached its first public test. On 6 October 2026, Glamsterdam switched on across the Sepolia testnet at 13:53 UTC, and early reports say the test chain kept finalizing normally afterwards.

There is still no mainnet date, and none has been announced for the next public test on Hoodi either. Developers are aiming at the fourth quarter of 2026, but nothing is committed, and earlier test rounds found bugs that pushed the schedule back.

This guide explains what the upgrade changes, where it stands, and what it could mean for people who hold ETH. It is written for beginners, and every figure comes from the sources linked at the end.

What Is the Ethereum Glamsterdam Upgrade?
Where the Ethereum Glamsterdam Upgrade Stands Now
Change 1: A Much Higher Gas Limit
Change 2: Enshrined Proposer-Builder Separation (ePBS)
Change 3: Block-Level Access Lists
Other Changes Users May Notice
What the Ethereum Glamsterdam Upgrade Could Mean for ETH Investors
Risks and Unknowns
Staying Safe During the Ethereum Glamsterdam Upgrade
Key Dates to Watch
More Reading on AbleTrust
FAQ
Final Thoughts

What Is the Ethereum Glamsterdam Upgrade?

Glamsterdam is the next hard fork of Ethereum, meaning a coordinated software change that every node on the network must adopt. The name combines two parts. The changes to the execution layer, where transactions run, are called Amsterdam. The changes to the consensus layer, where validators agree on blocks, are called Gloas. Put together, they give Glamsterdam.

This upgrade is aimed at one big problem: capacity. Ethereum has become the base layer for stablecoins, tokenised assets and thousands of apps, and its blocks are limited in how much work they can hold. Glamsterdam tries to raise that ceiling and change how blocks are built so the network can do more without losing safety.

It follows a pattern. Ethereum ships large changes in stages, tests them for months on private devnets and public testnets, and only then moves to the main network. That is why dates are described as tentative until each test passes.

Where the Ethereum Glamsterdam Upgrade Stands Now

Progress has come in steps. Glamsterdam first passed a private devnet rehearsal, known as Devnet-11, and then went live on the public Sepolia testnet on 6 October 2026 at 13:53 UTC. One consensus client, Prysm, shipped a last-minute patch so it could take part. About an hour after the switch, the chain was running normally, and it finalized within a few epochs. That reading comes from a news outlet’s look at the data, not from the Ethereum Foundation itself.

Earlier devnet rounds had found implementation bugs and finality issues, and developers moved their timelines because of them. Sepolia is a testnet milestone, not a mainnet launch, and a clean result there does not guarantee the same on the main network.

The next public step is Hoodi, another test network. No date has been confirmed, so be careful with any report that quotes one. Mainnet is targeted for Q4 2026, but nothing has been committed, and client teams say they will announce dates once they are decided.

Change 1: A Much Higher Gas Limit

The headline change is the block gas limit. Gas measures how much computation a block can hold. Testing covers raising the limit from roughly 60 million to as much as 200 million. On Sepolia, validators can signal that they prefer the higher number. The 200 million figure is a test target, not a confirmed mainnet setting, and the final mainnet limit has not been decided.

A larger limit gives each block more room for transactions. In theory, that lets Ethereum handle more activity before congestion pushes fees up. One report estimates a fee reduction of about 78.6% for many common operations when combined with gas pricing adjustments. That is an estimate from a single source, not a promise.

There is a trade-off. Larger blocks mean validators and other operators must handle more data and computation, and developers are also testing whether the network can pass larger blocks around quickly. That is one reason the upgrade is being tested slowly.

Change 2: Enshrined Proposer-Builder Separation (ePBS)

Today, most Ethereum blocks are assembled by specialist builders and passed to validators through outside services called MEV relays. These relays sit outside the protocol, so validators must trust them.

ePBS, defined in EIP-7732, moves this coordination into the protocol itself. In plain terms, the roles of the party proposing a block and the party building it are separated by the rules of Ethereum, not by third-party software.

The aim is a more neutral, more robust block-building process. For users, the effect is indirect: fewer points of failure in how transactions reach the chain.

Change 3: Block-Level Access Lists

Block-level access lists, defined in EIP-7928, change how transactions declare what they will touch. Each block states in advance which accounts and storage it will read and change.

That upfront information makes safer parallel execution possible. Instead of processing transactions strictly one after another, clients can run independent ones at the same time. This is one of the ways Glamsterdam supports a higher gas limit.

Other Changes Users May Notice

Glamsterdam is not only about capacity. The upgrade bundles 18 proposals in total, and a beginner-friendly outline lists several other changes:

Faster staking exits, so validators can leave staking sooner.
A smart wallet that can share the same address across multiple chains.
A visible record for ETH transfers.
Bigger smart contracts.
Cleaner recovery after many validators are penalised at once.

Details of these items are still being finalised, so treat the list as the current plan, not a final specification.

What the Ethereum Glamsterdam Upgrade Could Mean for ETH Investors

Upgrades matter to investors because they affect how useful the network is, but they do not guarantee price moves. As of late September, ETH traded around $2,650–$2,700, on pace for its best September since 2016 at roughly +7%. It was still more than 45% below its October 2025 peak near $4,946.

Demand from funds has been steady. Ethereum ETFs drew $689.9 million in the week to 25 September. That suggests institutions are still positioning for the network’s next phase.

Still, markets often price in expected upgrades well before they launch. A successful test could support sentiment, and a delay could weigh on it. The Fed’s October meeting and a 10-year Treasury yield above 5% may matter just as much for risk assets.

Risks and Unknowns

No mainnet date: Q4 2026 is a target, not a commitment.
Test results: Sepolia looks healthy so far, but earlier devnets found bugs and finality issues, and a testnet result does not guarantee mainnet behaviour.
Bigger blocks: they put more load on validators and need testing across the network.
Unconfirmed figures: the 200 million gas limit and the 78.6% fee estimate are test numbers, not final.

Staying Safe During the Ethereum Glamsterdam Upgrade

Big network upgrades attract scammers. Fake messages often claim that you must “swap”, “migrate” or “upgrade” your ETH, or offer a surprise airdrop tied to the fork. A network upgrade like Glamsterdam does not require holders to swap coins or hand over a seed phrase.

A few habits help. Never share your recovery phrase, and never connect a wallet to a link sent by a stranger. Check news on official Ethereum channels and well-known outlets, and be wary of urgent deadlines. If you hold ETH on an exchange, the exchange handles any technical steps for you.

If you run a node or a validator, the rules are different. You will need to update your software before the mainnet date, so follow the client teams’ release notes closely.

Key Dates to Watch

6 October 2026: Sepolia testnet activation (done, 13:53 UTC)
Hoodi testnet: next public test, no date confirmed
Q4 2026: mainnet target, with no date set

FAQ

What is the Ethereum Glamsterdam upgrade? It is the next major hard fork of Ethereum. It combines execution-layer changes called Amsterdam with consensus-layer changes called Gloas, and aims to raise capacity and improve block building.

When will the Ethereum Glamsterdam upgrade launch? There is no mainnet date. The Sepolia testnet activation happened on 6 October 2026, no date is confirmed for the Hoodi test, and mainnet is targeted for Q4 2026.

Will Glamsterdam lower Ethereum fees? It might. A higher gas limit gives blocks more room, and one report estimates about a 78.6% reduction for many common operations. That is an estimate, and real fees depend on demand.

What is ePBS in Ethereum? ePBS, or enshrined proposer-builder separation (EIP-7732), moves block-building coordination from outside MEV relays into the Ethereum protocol itself.

Do I need to do anything with my ETH? Ordinary holders usually do not need to act for a network upgrade. Node operators and validators must update their software. Always check official Ethereum sources before acting on any message about an upgrade.

Will the upgrade make ETH go up? Nobody can say. Upgrades can improve the network, but prices also depend on markets, interest rates and demand.

Final Thoughts

The Ethereum Glamsterdam upgrade is a long-running project that has just entered public testing. Its goals are higher capacity, a more robust way of building blocks, and quality-of-life changes for validators and wallets.

The sensible approach is patience. Watch how Sepolia behaves over the coming weeks and when the Hoodi date is announced, treat dates as tentative, and be careful with headline claims such as the 78.6% fee estimate until mainnet numbers exist.

We will update this guide as the tests progress.