> ## Documentation Index
> Fetch the complete documentation index at: https://base-a060aa97-roethke-b20-upgrade-pages.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Configuration Changelog

> A log of configuration changes to the Base networks.

This page tracks configuration changes to the Base networks, including updates to block building, network fees, and other network parameters.

## Base Mainnet

| Date | Change | Documentation |
| - | - | - |
| May 28, 2026 | Azul: Reduced per-transaction gas maximum to 16,777,216 (2^24) via EIP-7825 | [Per-Transaction Gas Maximum](/specifications/transactions/throughput-and-limits#per-transaction-gas-maximum) |
| February 19, 2026 | Increased Minimum Base Fee to 5,000,000 wei | [Minimum Base Fee](/specifications/transactions/network-fees#minimum-base-fee) |
| February 4, 2026 | Increased EIP-1559 Denominator to 125 | [EIP-1559 Fee Parameters](/specifications/transactions/network-fees#eip-1559-fee-parameters) |
| February 2, 2026 | Increased Minimum Base Fee to 2,000,000 wei | [Minimum Base Fee](/specifications/transactions/network-fees#minimum-base-fee) |
| January 22, 2026 | Increased Minimum Base Fee to 1,000,000 wei | [Minimum Base Fee](/specifications/transactions/network-fees#minimum-base-fee) |
| December 18, 2025 | Increased Minimum Base Fee to 500,000 wei | [Minimum Base Fee](/specifications/transactions/network-fees#minimum-base-fee) |
| December 4, 2025 | Enabled Minimum Base Fee (200,000 wei) | [Minimum Base Fee](/specifications/transactions/network-fees#minimum-base-fee) |
| September 17, 2025 | Enabled Per-Transaction Gas Maximum | [Per-Transaction Gas Maximum](/specifications/transactions/throughput-and-limits#per-transaction-gas-maximum) |
| September 11, 2025 | Ended testing Per-Transaction Gas Maximum | [Per-Transaction Gas Maximum](/specifications/transactions/throughput-and-limits#per-transaction-gas-maximum) |
| September 10, 2025 | Started testing Per-Transaction Gas Maximum | [Per-Transaction Gas Maximum](/specifications/transactions/throughput-and-limits#per-transaction-gas-maximum) |
| July 7, 2025 | Enabled Flashblocks | [Flashblocks](/specifications/transactions/transaction-ordering#flashblocks) |
| May 15, 2025 | Ended testing Flashblocks | [Flashblocks](/specifications/transactions/transaction-ordering#flashblocks) |
| May 15, 2025 | Started testing Flashblocks | [Flashblocks](/specifications/transactions/transaction-ordering#flashblocks) |

## Base Sepolia

| Date | Change | Documentation |
| - | - | - |
| April 20, 2026 | Azul: Reduced per-transaction gas maximum to 16,777,216 (2^24) via EIP-7825 | [Per-Transaction Gas Maximum](/specifications/transactions/throughput-and-limits#per-transaction-gas-maximum) |
| February 19, 2026 | Increased Minimum Base Fee to 5,000,000 wei | [Minimum Base Fee](/specifications/transactions/network-fees#minimum-base-fee) |
| February 10, 2026 | Increased EIP-1559 Denominator to 125 | [EIP-1559 Fee Parameters](/specifications/transactions/network-fees#eip-1559-fee-parameters) |
| February 10, 2026 | Increased Minimum Base Fee to 2,000,000 wei | [Minimum Base Fee](/specifications/transactions/network-fees#minimum-base-fee) |
| November 20, 2025 | Enabled Minimum Base Fee (200,000 wei) | [Minimum Base Fee](/specifications/transactions/network-fees#minimum-base-fee) |
| September 3, 2025 | Enabled Per-Transaction Gas Maximum | [Per-Transaction Gas Maximum](/specifications/transactions/throughput-and-limits#per-transaction-gas-maximum) |
| February 25, 2025 | Enabled Flashblocks | [Flashblocks](/specifications/transactions/transaction-ordering#flashblocks) |