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WordPress makes it easy to update a plugin to the latest version. Every plugin installed from the WordPress.org Plugin Directory alerts you when a new version of the plugin has been released. Updating the plugin is as simple as clicking the update notification listed just below the plugin details on the Plugin screen of your WordPress Dashboard.

Plugins not installed from the Plugin Directory can also be updated using the auto‐update functionality of WordPress. This is the method that premium plugins, specifically plugins that are sold on third‐party websites outside of the Plugin Directory, push out updates to their plugins. The plugin author must define where WordPress can download the latest version, and WordPress will take care of the rest. If the plugin author doesn't define this location, you must manually update the plugin.

Keeping plugins updated is an important part of keeping your website free from security vulnerabilities and bugs.