# hardhat

## 2.6.4

### Patch Changes

- b62ddf32: Fix a bug in Hardhat Network's solidity source maps processing. Thanks @paulberg!

## 2.6.3

### Patch Changes

- c4b32d7d: Fix a bug that prevented Hardhat Network's tracing engine from working if an interface was used as a mapping key (Thanks @k06a!)

## 2.6.2

### Patch Changes

- abc380ce: Fix issue with networks that support `eth_feeHistory` but that don't support EIP-1559 (#1828).