Catalina is no longer supported. For years, Apple only provides Safari updates for the 3 most recent versions of MacOS. Ever since Mavericks 10.9, you can consistently determine what the final version of Safari will be by looking at the point release OS code version.not showing in Catalina
Mavericks 10.9: Safari 9
Yosemite 10.10: Safari 10
El Capitan 10.11: Safari 11
Sierra 10.12: Safari 12
High Sierra 10.13: Safari 13
Mojave: 10.14: Safari 14
Catalina 10.15: Safari 15
Big Sur 11 (10.16): Safari 16
Safari 17 should be the final version for Monterey 12 (10.17), and Safari 18 should be final for Ventura 13 (10.18).
Ventura release is right around the corner, which means Ventura 13, Monterey 12 and Big Sur 11 will be the only operating systems receiving Safari 16.
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