# Upgradeability The core logic of the MINE contracts cannot be changed, but certain peripheral functions such as fee and pricing calculations can be updated. This update is done by implementing new fee / pricing contracts and updating the core contracts to use the new contracts. For example, the Vault contract has a `priceFeed` value that can be changed by the [Timelock](/general-resources/contracts/access-control/timelock.md) contract. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.minerva.money/general-resources/contracts/access-control/upgradeability.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.