Deep Dive
1. Poseidon Hash Function Abandoned (13 August 2026)
Overview: Ethereum's roadmap is pivoting away from the Poseidon hash function, a specialized tool built for zero-knowledge proofs, in favor of widely-used standards like SHA-2 or BLAKE2s. This simplifies the core protocol and leverages better-understood cryptography.
The change is driven by breakthroughs in "hash-friendly SNARKs," which make it efficient to prove traditional hashes within zero-knowledge systems. This reduces reliance on novel, complex cryptography and aligns with Ethereum's post-quantum security efforts, which favor hash-based signatures. The transition is a long-term architectural direction, not an immediate removal from existing rollups.
What this means: This is bullish for Ethereum because it makes the network's foundation more secure and easier to audit by using battle-tested technology. It paves the way for robust defenses against future quantum computers while simplifying development for core engineers.
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2. Protocol Cluster Update (May 2026)
Overview: The Ethereum Foundation released a periodic "protocol cluster" update to coordinate upcoming improvements. This format groups related Ethereum Improvement Proposals (EIPs) to streamline research, specification, and implementation across client teams.
While specific EIPs weren't detailed in available sources, the update builds on priorities outlined in February 2026: scaling Layer 1, improving user experience (like native account abstraction), and hardening the protocol against quantum computing. Such structured communication helps developers and validators prepare for coordinated network upgrades.
What this means: This is neutral to bullish for Ethereum as it demonstrates organized, forward-looking governance. It provides clarity for builders planning new applications and signals that major foundational upgrades are being actively managed.
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3. Glamsterdam Upgrade Activation (1 May 2026)
Overview: The Glamsterdam hard fork successfully activated, tripling Ethereum's gas limit from about 60 million to 200 million per block. This is the largest single increase in block capacity since the Merge, allowing the base layer to process more transactions and data.
The upgrade also introduced Enshrined Proposer-Builder Separation (ePBS), which restructures block building to reduce reliance on centralized intermediaries and minimize transaction manipulation. These changes followed extensive testing and coordination at a developer interop event.
What this means: This is bullish for Ethereum because it directly increases network throughput, which can lead to lower congestion fees during peak demand. It also enhances decentralization and censorship resistance by changing how blocks are created.
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4. Fusaka Upgrade Activation (3 December 2025)
Overview: The Fusaka upgrade built upon the Dencun hard fork's "blob" architecture to further scale data availability for Layer-2 rollups. It increased the target number of data blobs per block from 6 to 14 and raised the block gas limit from 45 million to 60 million.
These parameter adjustments provide more bandwidth for rollups to post their data cheaply to Ethereum, which is essential for securing these scaling solutions. The upgrade continued the strategy of shifting transaction execution to Layer 2 while strengthening Ethereum's role as a secure settlement layer.
What this means: This is bullish for Ethereum because it directly reduces costs for users on rollups like Arbitrum and Optimism, making decentralized applications faster and cheaper to use. It reinforces Ethereum's central role in a multi-layer ecosystem.
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Conclusion
Ethereum's recent codebase evolution shows a clear, dual focus: dramatically scaling base-layer capacity now while architecting for long-term security and simplicity. The network is executing a disciplined upgrade cadence, from Fusaka's parameter tweaks to Glamsterdam's major throughput leap and the strategic pivot toward quantum-resistant cryptography. How will these cumulative technical improvements translate into sustained user adoption and developer activity in the coming year?