Analysis · Ethereum & L2s
The upcoming upgrade combines the Amsterdam and Gloas updates, introducing enshrined proposer-builder separation and block-level access lists to scale Layer 1 execution.
Key point 1 of 3
01
The Glamsterdam upgrade is scheduled to activate on the Sepolia testnet at epoch 353,024 on October 6, 2026.
Key point 2 of 3
02
The upgrade introduces enshrined proposer-builder separation (ePBS) to eliminate reliance on external middleware for block production.
Key point 3 of 3
03
Block-level access lists (BALs) will be enforced to enable parallel state reading and more efficient transaction validation.
Context
The Glamsterdam upgrade represents the next major step in Ethereum's L1 scaling roadmap following the Fusaka upgrade. It combines the Amsterdam execution layer and Gloas consensus layer updates to address long-standing…
Why it matters
Sepolia node operators and stakers must update their clients before October 6, 2026. Developers must audit smart contracts for gas repricing, while validators must adapt to new ePBS duties and client-specific gas limit…
What to watch
The next major milestone is the Sepolia activation on October 6, 2026, at 13:53:36 UTC. Success there will dictate the scheduling of the Hoodi testnet and mainnet activation dates.
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