The Plugin Update Locker plugin allows users to prevent specified plugins in Obsidian from updating, ensuring they remain on a stable version. This helps avoid compatibility issues or unwanted feature changes caused by updates. The plugin achieves this by modifying the version number in the plugin’s `manifest.json` file, bypassing Obsidian's update detection. Users can lock or unlock updates for individual plugins through a configuration page, enabling greater control over their plugin versions. This is particularly useful for users who rely on specific plugin functionalities and want to delay updates until stability is confirmed.