# Upgradability

## Overview

The governor is responsible for upgrading contracts when required.

## Contracts

* Immutable
  * `Pool.sol`
  * `PoolAddressesProvider.sol`
* UUPS upgradable
  * `Receivables.sol`
  * `IsleGlobals.sol`
* Transparent Upgradable
  * `PoolConfigurator.sol`
  * `WithdrawalManager.sol`
  * `LoanManager.sol`