What Happens to Ethereum on October 6
Ethereum’s next upgrade, Glamsterdam, will reach a public test network on October 6, 2026. It doesn’t reach the main Ethereum network that day. For anyone holding ETH on an exchange or in a wallet, that distinction decides whether October 6 calls for any action at all, and the answer is that it doesn’t.
Glamsterdam activates on the Sepolia testnet, one of Ethereum’s public rehearsal networks. Sepolia runs the same software as the main chain, but the ETH on it is test currency, so a fork there moves no money and changes no balances. The Ethereum Foundation has set only this testnet date. For the main network it names the fourth quarter of 2026 and adds, on its own roadmap page, that the date remains unconfirmed.
Why a testnet fork is not a launch
An Ethereum upgrade moves through a fixed sequence, and the order is the reason October 6 is only a rehearsal.
The earliest stage uses devnets, short-lived developer networks built for one upgrade and shut down afterward. Glamsterdam sits there now, according to the Foundation, where the team is testing the separate client programs that run the network against each other.
Public testnets come next. Sepolia is one, and Hoodi, the network tailored to validators, usually follows it. Only after those run cleanly, does the main network, where real ETH moves, get a date.
That sequence explains the quarter-without-a-day status. At least one more testnet fork, on Hoodi, sits between October 6 and any mainnet activation, and Hoodi has no scheduled date yet either.
What Glamsterdam changes
The upgrade bundles several technical changes that prepare Ethereum to carry more data per block.
The most prominent is enshrined proposer-builder separation, or ePBS, filed as EIP-7732. Ethereum blocks are built in two roles today, a proposer whose turn it is and a builder that assembles the contents, and that handover currently runs through third-party software both sides have to trust, such as MEV-Boost.
ePBS pulls the handover into the protocol and settles the builder’s payment without that trusted intermediary, though builders and proposers can still use outside services for functions the protocol doesn’t cover. The Foundation says the change widens the window for a block to travel across the network from around two seconds to about nine, which lets each block carry more data.
A second change, block-level access lists (EIP-7928), lets Ethereum process transactions in parallel. The network runs transactions one after another today because it doesn’t know in advance which data each will touch.
A block-level access list records, before execution, which accounts and storage slots a block uses and the values they end up with, so the transactions that don’t collide can run at the same time. The list also lets a freshly started node adopt the network state without recomputing every transaction. A companion specification, EIP-8159, is mandatory for execution clients so nodes can exchange these lists.
The third change, EIP-8037, resets the gas pricing for data stored permanently on Ethereum. It ties cost to the actual byte count and targets predictable growth of stored data at about 120 gibibytes a year, so the network keeps running on commodity hardware. The Foundation said contracts with hard-wired gas amounts may behave differently afterward, which is the kind of thing the testnet stage exists to catch.
Who needs to act on October 6
The date is a working deadline for one group, anyone running a node or validator on Sepolia. Both the execution client and the consensus client have to be updated before activation, and a node that misses the update drops off the valid chain.
The same task arrives on the main network once that date is set, for every validator. Anyone staking through a provider has nothing to do on the client side, because the operator handles it.
How to recognize the real mainnet date
A mainnet date arrives in a set order, which gives a way to measure any report against it. A Hoodi fork date would need to appear first, since that step sits between Sepolia and the main network. The status line on the Foundation’s roadmap page would then change from “date not yet confirmed” to an actual date.
And a real fork announcement names an epoch, the numbered section of the chain at which activation happens, along with client versions. A report that describes Glamsterdam without naming Sepolia, Hoodi or the mainnet, or without an epoch, is describing a plan.
What comes after
Glamsterdam is not the end of the roadmap. The next upgrade, Hegotá, targets 2027, and Ethereum co-founder Vitalik Buterin has described it as possibly the last ordinary fork before development turns more toward cryptography, including quantum-safe methods and new proof-system and verification work such as recursive STARKs.
The changes in Glamsterdam are preparation for higher gas limits: new block-production rules, parallel transaction processing, repriced permanent storage and the data-exchange specification that ties them together. The Foundation names 200 million gas per block as a target, with testing now running at a reference value of 150 million.
For ETH holders, October 6 is a date to note and nothing more. The action items, if any, belong to node operators on Sepolia, and later to everyone running a validator once the main network finally has a day attached to it.