WordPress.org

Why would I want to disable the core update system?

Most people will not want to (and should not) disable this feature. It's a fantastic feature of WordPress and I'm fully in support of it. However, administrators who maintain multiple installations of WordPress on behalf of other people (eg. clients) may not want update notifications to be shown to the users of these installations. This plugin is for them.

Can I disable the plugin update notifications too?

Yes. Please see the Disable WordPress Plugin Updates plugin.

Can I disable the theme update notifications too?

Yes. Please see the Disable WordPress Theme Updates plugin.