Update Bundled Plugins
Once you’ve updated the theme you should see an admin notification which will lead you through the process of updating the bundled plugins (if there are any which needs updating).
Alternatively, you can download the complete theme package from your ThemeForest account / Downloads, unzip it and check out the changelog.txt file to see which plugins were updated in the recent version. You will find all installable plugin files in the Plugins folder. Now, either unzip each plugin file you want to update and upload them under wp-content / plugins via FTP (overwrite the existing folders), or upload each .zip file via admin under Plugins / Add New / Upload Plugin (you will have to deactivate and remove your current versions of those plugins first).