Ethereum Foundation Activates BPO-1, Increasing Blob Capacity to 15 per Block

The Ethereum Foundation announced that BPO-1 was activated on Dec. 10, raising the blob capacity on the Ethereum network to 15 blobs per block, according to an Ethereum Foundation post on X and monitoring reports. The change increases the amount of data space available for Layer-2 rollups without requiring a hard fork and follows the Fusaka upgrade earlier in December that introduced mechanisms for incremental scalability adjustments. A subsequent capacity increase, BPO-2, is scheduled for January 7, 2026, which will further raise blob parameters as outlined in the Ethereum upgrade roadmap.