Ethereum’s much-anticipated Pectra upgrade has encountered another hurdle, this time on the Sepolia testnet.

Tim Beiko, Ethereum Foundation’s Protocol Support Lead, disclosed the latest complication in a March 5 post on X.

He explained that the problem stems from a custom deposit contract on Sepolia, which has disrupted some execution layer (EL) clients. The malfunction has affected transactions within blocks.

According to him:

“We’re investigating an issue caused by the custom deposit contract on Sepolia. This has caused some EL clients to have issues including transactions in blocks.”

Emiliano Bonassi, Head of Product at crypto infrastructure firm Conduit, corroborated this development, revealing that he observed that the network was propagating empty blocks—another indication of technical instability.

Notably, this setback emerged less than two hours after Beiko had announced that Pectra had been successfully finalized on Sepolia.

Sepolia is a crucial testing ground for Ethereum’s upgrades, simulating real-world network conditions. This testnet rollout was expected to be the final major step before the Pectra upgrade goes live.

However, given the latest technical issues, the timeline for the mainnet launch—widely anticipated for next month—now remains uncertain.

Pectra challenges

Pectra is considered Ethereum’s most ambitious hard fork and is designed to enhance both developer and user experiences.

Meanwhile, this is not the first time Pectra has faced complications. The Holesky testnet recently experienced issues due to incorrect deposit contract addresses, leading to chain splits and delayed finality.

While developers acted swiftly to resolve the problem, stabilization efforts are still underway.

Commenting on the broader implications of these testnet issues, Christine Kim, a researcher at Galaxy Digital, noted that Ethereum’s growing ecosystem could extend the time required for future upgrades as ensuring a smooth transition becomes increasingly complex.

Kim stated:

“It is important that the ethereum ecosystem is ready for the pectra upgrade and has the adequate testing infrastructure to ensure a smooth transition through the hard fork. The bigger the eth ecosystem becomes, the longer it may take for ethereum to upgrade safely.”

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