# Use a Plugin for Safe Upgrades When setting up a proxy for a contract, there are specific restrictions concerning the contract's code. Notably, the contract mustn't include a constructor, and it's advised to steer clear of utilizing operations like selfdestruct or delegatecall due to security considerations. In addition, storage variables in the proxy can potentially be overwritten when deploying new versions of the implementation contract. This happens because the storage layout of the proxy and implementation must remain consistent across upgrades. Any mismatch in storage variable declarations or order can result in overwritten or corrupted data, leading to unpredictable behavior. It is highly recommended to use a [plugin](https://docs.openzeppelin.com/upgrades-plugins/1.x/) that ensures the newly introduced contract complies with the safe upgrades rules. --- # 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.optimumsec.xyz/coding/plugin-for-safe-upgrades.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.