---
title: "Configuration Changelog"
description: "A dated log of block-building, fee, and other network parameter changes for Base Mainnet and Base Sepolia."
source: https://basehub.org/network/configuration-changelog/
---
The tables below track network parameter changes — block building, fees, and other operational settings — for Base Mainnet and Base Sepolia.

## Base Mainnet

| Date | Change | Documentation |
|------|--------|---------------|
| February 19, 2026 | Increased Minimum Base Fee to 5,000,000 wei | [Minimum Base Fee](/network/network-fees/#minimum-base-fee) |
| February 4, 2026 | Increased EIP-1559 Denominator to 125 | [EIP-1559 Fee Parameters](/network/network-fees/#eip-1559-fee-parameters) |
| February 2, 2026 | Increased Minimum Base Fee to 2,000,000 wei | [Minimum Base Fee](/network/network-fees/#minimum-base-fee) |
| January 22, 2026 | Increased Minimum Base Fee to 1,000,000 wei | [Minimum Base Fee](/network/network-fees/#minimum-base-fee) |
| December 18, 2025 | Increased Minimum Base Fee to 500,000 wei | [Minimum Base Fee](/network/network-fees/#minimum-base-fee) |
| December 4, 2025 | Enabled Minimum Base Fee (200,000 wei) | [Minimum Base Fee](/network/network-fees/#minimum-base-fee) |
| September 17, 2025 | Enabled Per-Transaction Gas Maximum | [Per-Transaction Gas Maximum](/network/block-building/#per-transaction-gas-maximum) |
| September 11, 2025 | Ended testing Per-Transaction Gas Maximum | [Per-Transaction Gas Maximum](/network/block-building/#per-transaction-gas-maximum) |
| September 10, 2025 | Started testing Per-Transaction Gas Maximum | [Per-Transaction Gas Maximum](/network/block-building/#per-transaction-gas-maximum) |
| July 7, 2025 | Enabled Flashblocks | [Flashblocks](/network/block-building/#flashblocks) |
| May 15, 2025 | Ended testing Flashblocks | [Flashblocks](/network/block-building/#flashblocks) |
| May 15, 2025 | Started testing Flashblocks | [Flashblocks](/network/block-building/#flashblocks) |

## Base Sepolia

| Date | Change | Documentation |
|------|--------|---------------|
| February 19, 2026 | Increased Minimum Base Fee to 5,000,000 wei | [Minimum Base Fee](/network/network-fees/#minimum-base-fee) |
| February 10, 2026 | Increased EIP-1559 Denominator to 125 | [EIP-1559 Fee Parameters](/network/network-fees/#eip-1559-fee-parameters) |
| February 10, 2026 | Increased Minimum Base Fee to 2,000,000 wei | [Minimum Base Fee](/network/network-fees/#minimum-base-fee) |
| November 20, 2025 | Enabled Minimum Base Fee (200,000 wei) | [Minimum Base Fee](/network/network-fees/#minimum-base-fee) |
| September 3, 2025 | Enabled Per-Transaction Gas Maximum | [Per-Transaction Gas Maximum](/network/block-building/#per-transaction-gas-maximum) |
| February 25, 2025 | Enabled Flashblocks | [Flashblocks](/network/block-building/#flashblocks) |