If you wish, try upgrading the macOS to get the latest version of macOS available for your Mac..
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about old versions of macOS that are still available
Please click open the links for more info.
https://support.apple.com/en-us/HT201541
About updates.
https://support.apple.com/en-us/HT204416
See also:
Software update missing?
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Software update may not be available for the macOS installed on your Mac.
Consider upgrading to a later version if compatible with your system.
Update: A later version of the currently installed software. Learn about macOS Big Sur updates, for example.
Upgrade: A major new version, often with new system requirements. Each macOS upgrade has a unique name, such as macOS Big Sur.
Learn more about installing the latest macOS upgrade. Some old versions of macOS are also available.
Published Date: June 11, 2021
https://support.apple.com/en-us/HT201541