Ethereum's Glamsterdam Upgrade Enters Final Devnet Stage, Eyes 200M Gas Limit by H2 2026

Ethereum's next major network upgrade has locked in its final specifications. Glamsterdam, the protocol's planned enhancement targeting the second half of 2026, has reached its final devnet stage with ten Ethereum Improvement Proposals (EIPs) now finalized, clearing the path for mainnet activation later this year.

The upgrade bundles two critical components: Encrypted Proposer-Builder Separation (ePBS) and Block-Level Access Lists. Together, these changes aim to increase Ethereum's gas limit from its current ~30 million per block to 200 million, a roughly sixfold expansion that would significantly boost network throughput.

Glamsterdam represents the latest step in Ethereum's incremental scaling roadmap. The network has undergone steady optimization since Shanghai in 2023, which introduced staking withdrawals, followed by Dencun in 2024, which added blob storage for Layer 2 transactions, and Pectra in 2025. Each upgrade has focused on specific bottlenecks rather than attempting wholesale protocol redesign. Glamsterdam continues this philosophy by targeting gas efficiency and MEV mitigation.

The ePBS component addresses a structural problem in how blocks are built. Currently, block builders (specialized entities that order transactions) have visibility into pending transactions before inclusion, allowing them to extract maximal extractable value (MEV) by front-running or sandwich-attacking user transactions. Encryption shields pending transaction data until after block construction, reducing MEV opportunities and making the network fairer for ordinary users.

Block-Level Access Lists complement this by improving how the EVM (Ethereum Virtual Machine) handles state access. Access lists pre-declare which accounts and storage slots a transaction will touch, reducing computational overhead and allowing validators to process more transactions within the same gas budget. This lower-level optimization compounds with ePBS to enable the gas limit increase.

The 200 million gas target is ambitious. Current block gas limits hover around 30 million, meaning Glamsterdam would multiply capacity roughly sixfold. For context, Ethereum currently processes roughly 1.2 million transactions per day on-chain. A sixfold gas increase wouldn't necessarily mean sixfold transaction throughput, since transaction complexity varies. But it would create meaningful headroom for smart contract interactions and lower transaction fees during peak demand periods.

Reaching final devnet status means the core protocol changes are locked and tested in a controlled environment. Devnets are fully functional but isolated blockchains where developers can stress-test changes before mainnet deployment. The transition from devnet to testnet (like Sepolia or Goerli) to mainnet typically takes weeks to months, depending on the complexity of changes and any bugs discovered during testing.

The H2 2026 timeline is a target, not a guarantee. Ethereum's upgrade history shows delays are common. Shanghai was originally planned for earlier in 2023, Dencun slipped multiple times, and Pectra faced pushback and rescheduling. Technical challenges, security concerns, or community disagreement can push mainnet activation into 2027 or beyond. However, the finalization of ten EIPs and the advancement to final devnet suggests the core work is substantially complete.

For ETH holders and stakers, Glamsterdam's implications are mixed. Higher gas limits will reduce fee pressure on users, which is positive for adoption and user experience. But it may compress validator rewards in the short term. Validators earn fees from transactions in blocks they propose, and higher gas limits could dilute per-transaction fee value if total fee volume doesn't scale proportionally. Increased network activity from lower fees could offset this over time.

The upgrade also signals Ethereum's continued commitment to incremental improvement over radical redesign. While Layer 2 solutions like Arbitrum and Optimism handle the bulk of scaling work, mainnet optimizations remain important for the base layer's health and security. Glamsterdam won't solve Ethereum's fundamental scalability challenge, but it buys the network more runway before L2 solutions become the exclusive scaling path.

Developer sentiment appears positive. The finalization of ten EIPs without major controversy suggests broad consensus within the core protocol team and community. The next milestone is testnet deployment, likely within weeks, followed by a period of public testing and monitoring before mainnet activation.