Ethereum Devs increase the blob limit from 15 to 21

The first of many improvements planned to scale the Ethereum ecosystem in 2026, the Ethereum scale went through its second blob parameter-only hard fork on Wednesday, raising the blob limit from 15 to 21.

The second BPO hard fork, which started at 1:01:11 UTC on Wednesday, will further increase Ethereum's data flow by allowing additional transactions to be hit in bulk.

The BPO hard fork also increased the blob target from 10 to 14, which appears to be the most important parameter to be widely considered, as continuously approaching the 21-blob limit can overload node bandwidth and storage.

One blob unit fits 128 kilobytes of data, which means Ethereum can now store up to 2,688 kilobytes per block.

Blobs help destabilize the Ethereum mainnet

While blobs increase transaction flow on Ethereum layer 2s, they help stabilize gas payments on the Ethereum mainnet as the network becomes less congested.

YCharts data shows that Ethereum transaction fees have been very stable since the first BPO hard fork on December 9, 2025.

Increasing the gas limit on the radar

At the Ethereum All Core Developers meeting on December 15, participants discussed the idea of ​​increasing the network gas limit from 60 million to 80 million after the implementation of the second BPO dry fork.

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Doing that directly increases the number of transactions and smart contracts that fit into each Ethereum block – further increasing overall flow while reducing fees.

The Glamsterdam Hard Fork is focused on elasticity.

Later in 2026, the Glamsterdam hard fork will allow the gas limit to reach 200 million and introduce “perfectly parallel processing”.

According to Ethereum reform proposal-7928, fully parallel processing through Block Access Lists will be implemented on Ethereum, which aims to transform Ethereum's single-lane transaction process into a multi-lane highway, which will increase transaction flow.

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