Some updates do not contribute anything (e.g. correct a typo in a translation into a language we do not use), and we ignore this update. We cannot do some updates because it will lead to a conflict with another plugin or theme, and you need to give the author of a given solution time to adapt the plugin to a given update (pretty frequent cases, e.g. when working with WooCommerce).
Read more about plugin updates in our article Update, wait, ignore?