Meeting Summary:
ACDT number 99 was held on October 5, 2026, focusing on DevNet updates and the upcoming Sepolia upgrade scheduled for the next day at 13:53 UTC. Stefan from PandOps reported on recent Shadow Fork testing of Sepolia, where issues were identified with Nethermind, Bezu, EtherX, and fork boundary-related P2P issues, though most problems were resolved in the second round. Multiple clients including Nethermind, Lighthouse, Geth, and others confirmed readiness for the Sepolia upgrade with version updates and gas limit configurations in place. The conversation ended with a discussion about ETH call RPC method gas limits, where Maria proposed aligning the execution gas limits with transaction limits to address use cases for heavy view functions and renderers, with Gary from Geth confirming a fix was already in progress.
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The meeting focused on DevNet updates, particularly the recent Sepolia Shadow Fork testing. Stefan reported that the first round encountered issues with Nethermind, Bezu, and EtherX, but the second round went more smoothly with Nethermind performing well and most issues being addressed. Ben from Nethermind confirmed that their 2.1 release fixed the issues encountered during testing. The team discussed upcoming plans for a Sepolia Normal Fork the following day, and Barnabas mentioned rolling out image updates and enabling QUIC on CLs, though this resulted in some validator loss due to insufficient supernodes.
The team discussed the upcoming Sepolia upgrade scheduled for tomorrow at 13:53 UTC. James from Prysm announced a patch release (version 7.2.1) to address configuration issues for builders and enable partial data columns by default. Ben noted that many Nethermind nodes are running very old versions and questioned how to encourage upgrades, though Parithosh indicated the validator chat would be the main channel for communication. The conversation ended with Mario rounding up clients for any additional comments, though no further updates were provided.
The team conducted a readiness check for the upcoming Sepolia fork. Most clients reported being ready, with updates on their respective versions and fixes. The 200 million gas limit was confirmed for several clients, though Enrico from Teku noted it might not be included in the current release but could be set via command line. Nico from Lodestar mentioned running a builder on Sepolia and shared the URL for potential connections. The team confirmed that most clients, including Geth, Lighthouse, Nimbus, Lodestar, and Grandin, were prepared for the Sepolia fork.
The team discussed preparations for the upcoming Sepolia fork happening within 24 hours. Barnabas explained that builders will not be included before the fork due to limitations with the special deposit contract on Sepolia, but builders can make deposits immediately after the fork using regular Sepolia ETH. The team also discussed versioning processes for testnets, with Parithosh noting that updates are communicated through validator chats for Sepolia and Hoodi, while mainnet relies on blog posts, Twitter, and release channels. The conversation ended with plans to move to breakout sessions, with Jihoon leading the CL breakout discussion.
Maria discussed a potential change to ETH call behavior where Geth is implementing the same gas limit for execution as transactions (16 million gas), which could break use cases for simulating calls that exceed this limit. The group agreed that Gary from Geth has already confirmed fixing this issue, and Maria will follow up to ensure the fix is included in the execution APIs specification. The team confirmed this change doesn’t require consensus and aligns with existing behavior where transactions exceeding 60 million gas would fail.
Next Steps:
- james: Release Prism version 7.2.1 for Sepolia, including the patch for builder configuration issues and partial data columns.
- Marius van: Release the new Geth fix for Sepolia as quickly as possible.
- Enrico: Follow up on chat to confirm if Teku 96.9.1 includes the 200 million gas limit for Sepolia, and plan a new release if necessary.
- Nico: Share the URL for the Lodestar builder on Sepolia for others to connect.
- Pooja: Request authors of proposals for the Glamsterdam upgrade to move their proposals to last call and submit PRs before the next EIP Editing Office Hour.
- Maria: Follow up with Gary (Geth) to confirm if the fix for ETH call gas limit is merged, and communicate the resolution on ethereum-magicians.
Recording Access: