BNB Chain’s Binance Smart Chain is gearing up for the Pasteur hardfork scheduled for August 25, 2026, at 02:30 UTC. This upgrade necessitates that all node operators update to client version 1.7.7. The changes included in this hardfork are crucial for improving security, enhancing staking governance, and significantly increasing the network's transaction capacity. The goal of these improvements is to nearly double the mainnet throughput by late 2026.
#What Does the Pasteur Hardfork Change?
The hardfork revolves around a comprehensive proposal known as BEP-673, incorporating two distinct upgrades. The first of these is BEP-682, which addresses a vulnerability in CometBFT light client validation. Previously, there was a potential risk of duplicate validators going undetected during cross-chain bridge interactions. BEP-682 resolves this issue by ensuring that duplicate bridge validators are explicitly rejected.
The second improvement, BEP-695, enhances the security surrounding staking and governance. This initiative focuses on tightening the regulations around validator keys. By making it more challenging to manipulate the rules that govern validator participation in consensus processes, the network improves its resilience against potential exploitation.
In addition to these BEPs, the Pasteur upgrade introduces system contract modifications aimed at expanding transaction capacity. BNB Chain has set a clear objective: to double its mainnet throughput in the latter half of 2026, and these contract-level adjustments are essential steps in achieving that ambition.
#Has the Upgrade Passed Testing?
The Chapel testnet activated a version of the Pasteur hardfork on July 21, 2026, running client version v1.7.6. This early deployment allowed developers crucial time to gather live data in preparation for the mainnet activation. The transition from v1.7.6 on the testnet to v1.7.7 on the mainnet indicates that refinements were made based on that testnet deployment. All validators, exchanges, and decentralized applications have been duly informed about this necessary upgrade ahead of time.
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#How Does Pasteur Align with BNB Chain’s Future Plans?
The naming of the Pasteur upgrade aligns with BNB Chain's practice of using scientist-themed titles for its hardforks. It follows previous upgrades such as Pascal, Mendel, and Fermi, each contributing incremental yet significant enhancements. It is essential for staking participants to stay informed about the changes introduced in BEP-695. The stricter validator key rules could impact how certain staking operations are configured, and validators who do not adapt their settings might face penalties or be excluded from participating in the active validator set.