Jon Cave

If you don’t check your admin panel on your WordPress install very often (maybe because you prefer to use remote publishing) or you want to make sure 
that your clients’ WordPress installations are updated, then this is the plugin for you. You don’t have to login to your admin panel regularly, 
suscribe to an RSS feed, or do anything apart from installing this plugin to be notified when an update to WordPress is released.
All you have to do is install Update Notifier and forget it until you receive an email telling you to update.
To change Update Notifier’s options, go to Update Notifier under the main Settings menu. From there you can add a secondary email address 
which will also receive update notifications and you can activate update notifications for themes and plugins.

Update Notifier

Sends email notifications if a new version of WordPress available. Notifications about updates for plugins and themes can also be sent.

ABCdatos

To update your WordPress is a time consuming task you can’t avoid. Without it, your site will be in trouble and you’ll be regretful. Knowing this, here you have a powerful tool to help you to maintain your plugins updated.
Select the cases for automated updates and the manual ones based on the update level and single plugin if you want or let the plugin decide for you. Stability vs. safety is the balance. Let the plugin take itself the decision if you like it.
<a href="https://semver.org/" rel="nofollow ugc">Semantic version numbering</a> didides version numbers in three main blocks: major, minor and patch in this way: major.minor.patch. If all the plugin authors were working fine, when only patch version number changes, bug and security fixes in a compatible way were done, when the minor number increases, new functionality are added in a backwards compatible way. Major version changes are incompatible and may require additional work with your site.
You’ll never know in advance when an error in a plugin can make your WordPress site fail, nor will you know in advance that you are leaving a security hole to be attacked if you do not update.
The plugin allways allow to update itself to avoid locks as happened in version 1.1.9 requiring a manual update.

Automatic Safe Update

To update your plugins with safe and automated mode. Upgrade installed themes too.

Update Notifier vs Automatic Safe Update