diff --git a/Library/Homebrew/os/mac/version.rb b/Library/Homebrew/os/mac/version.rb
index f0652cf8c8f52..962b88fa73425 100644
--- a/Library/Homebrew/os/mac/version.rb
+++ b/Library/Homebrew/os/mac/version.rb
@@ -6,6 +6,7 @@ module OS
   module Mac
     class Version < ::Version
       SYMBOLS = {
+        catalina:    "10.15",
         mojave:      "10.14",
         high_sierra: "10.13",
         sierra:      "10.12",