What Is Glamsterdam? Ethereum’s Next Major Upgrade Explained

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Ethereum's Glamsterdam upgrade is targeted for H2 2026 (developers are aiming for Q4) but has no confirmed mainnet date yet as final specifications, client readiness, security reviews and public testnets will determine timing. The proposal would add ePBS and BALs to improve block building and enable parallel processing with a targeted 200M gas limit, and ETH holders will not need to swap tokens, a development that supports crypto adoption, DeFi throughput and protocol security.
- Glamsterdam targets H2 2026, while its official mainnet launch date remains unconfirmed.
- ePBS and BALs could improve block building and prepare Ethereum for parallel processing.
- Developers target a 200M gas limit, while ETH holders will not need to swap their tokens.
The Glamsterdam upgrade is planned for the second half of 2026. In an X post, SSV Network said developers are working toward Q4, although Ethereum has not confirmed a mainnet date. The planned changes could reshape block production, prepare parallel processing and update network costs.
Ethereum’s official roadmap uses the broader H2 2026 window. Final specifications, client readiness, security reviews and public-testnet results would determine when the upgrade reaches mainnet.
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