Worked on the Qiskit/qiskit repository to enhance compatibility and stability by implementing a configurable minimum QPY version check during QPY file loading. This feature, developed in Python, introduced early validation of QPY file versions against a user-defined minimum, ensuring that files incompatible with newer Qiskit releases are flagged immediately. The approach focused on configuration management and robust error handling, reducing silent incompatibilities and runtime failures. By clarifying error messaging and integrating the check into the load path, the work improved maintainability for both users and contributors, while laying groundwork for future compatibility checks with other file formats and testing workflows.