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.