The updates are not exclusively for macOS Big Sur users, there is also a new version of macOS Catalina but in this case of security. These types of updates are usually common when Apple releases the final versions of the latest operating system available In macOS, with them you improve security and usually also add changes to the available versions of your Safari browser.
It is recommended that all users install Security Update 2021-001, as it improves the security of macOS.
In this case the new version of macOS Catalina 10.15.7 It seems that it is directly related to the security of the system and we will find few more changes in it. On the other hand, Safari also adds several changes in terms of stability and security.
Undoubtedly, these new versions have to be installed as soon as possible if we do not have automatic updates configured on our Mac. Therefore, we recommend that look in the System Preferences within the Updates option. When you access it, it will show you the option to update if necessary. Be that as it may if you are using a version prior to macOS Big Sur on your Mac because you cannot install it, we recommend that you check if you have this new version available and install it as soon as possible to enjoy the security news on your Mac.