> ## Documentation Index
> Fetch the complete documentation index at: https://docs.base.org/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](/base-chain/network-information/throughput-and-limits#per-transaction-gas-maximum) |
| February 19, 2026  | Increased Minimum Base Fee to 5,000,000 wei                                 | [Minimum Base Fee](/base-chain/network-information/network-fees#minimum-base-fee)                                |
| February 4, 2026   | Increased EIP-1559 Denominator to 125                                       | [EIP-1559 Fee Parameters](/base-chain/network-information/network-fees#eip-1559-fee-parameters)                  |
| February 2, 2026   | Increased Minimum Base Fee to 2,000,000 wei                                 | [Minimum Base Fee](/base-chain/network-information/network-fees#minimum-base-fee)                                |
| January 22, 2026   | Increased Minimum Base Fee to 1,000,000 wei                                 | [Minimum Base Fee](/base-chain/network-information/network-fees#minimum-base-fee)                                |
| December 18, 2025  | Increased Minimum Base Fee to 500,000 wei                                   | [Minimum Base Fee](/base-chain/network-information/network-fees#minimum-base-fee)                                |
| December 4, 2025   | Enabled Minimum Base Fee (200,000 wei)                                      | [Minimum Base Fee](/base-chain/network-information/network-fees#minimum-base-fee)                                |
| September 17, 2025 | Enabled Per-Transaction Gas Maximum                                         | [Per-Transaction Gas Maximum](/base-chain/network-information/throughput-and-limits#per-transaction-gas-maximum) |
| September 11, 2025 | Ended testing Per-Transaction Gas Maximum                                   | [Per-Transaction Gas Maximum](/base-chain/network-information/throughput-and-limits#per-transaction-gas-maximum) |
| September 10, 2025 | Started testing Per-Transaction Gas Maximum                                 | [Per-Transaction Gas Maximum](/base-chain/network-information/throughput-and-limits#per-transaction-gas-maximum) |
| July 7, 2025       | Enabled Flashblocks                                                         | [Flashblocks](/base-chain/network-information/transaction-ordering#flashblocks)                                  |
| May 15, 2025       | Ended testing Flashblocks                                                   | [Flashblocks](/base-chain/network-information/transaction-ordering#flashblocks)                                  |
| May 15, 2025       | Started testing Flashblocks                                                 | [Flashblocks](/base-chain/network-information/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](/base-chain/network-information/throughput-and-limits#per-transaction-gas-maximum) |
| February 19, 2026 | Increased Minimum Base Fee to 5,000,000 wei                                 | [Minimum Base Fee](/base-chain/network-information/network-fees#minimum-base-fee)                                |
| February 10, 2026 | Increased EIP-1559 Denominator to 125                                       | [EIP-1559 Fee Parameters](/base-chain/network-information/network-fees#eip-1559-fee-parameters)                  |
| February 10, 2026 | Increased Minimum Base Fee to 2,000,000 wei                                 | [Minimum Base Fee](/base-chain/network-information/network-fees#minimum-base-fee)                                |
| November 20, 2025 | Enabled Minimum Base Fee (200,000 wei)                                      | [Minimum Base Fee](/base-chain/network-information/network-fees#minimum-base-fee)                                |
| September 3, 2025 | Enabled Per-Transaction Gas Maximum                                         | [Per-Transaction Gas Maximum](/base-chain/network-information/throughput-and-limits#per-transaction-gas-maximum) |
| February 25, 2025 | Enabled Flashblocks                                                         | [Flashblocks](/base-chain/network-information/transaction-ordering#flashblocks)                                  |