Worked on stabilizing the CI and test environment for the PlasmaControl/DESC repository by addressing dependency consistency issues. Focused on pinning the matplotlib version to ensure tests produced reliable and reproducible results across different environments. This was achieved by programmatically removing any existing matplotlib entry from requirements.txt and prepending the desired version, ensuring all tests ran against the correct dependency. Additionally, updated the mpl_tests.yml workflow to install the specified matplotlib version, following project guidance. Utilized Shell scripting, YAML, and GitHub Actions to implement these changes, ultimately improving the reliability of automated testing and preventing issues caused by dependency drift.