diff --git a/Library/Homebrew/os/mac.rb b/Library/Homebrew/os/mac.rb
index ab2b683098..c0c898fb6a 100644
--- a/Library/Homebrew/os/mac.rb
+++ b/Library/Homebrew/os/mac.rb
@@ -44,14 +44,14 @@ module OS
       # TODO: bump version when new macOS is released and also update
       # references in docs/Installation.md and
       # https://github.com/Homebrew/install/blob/master/install
-      Version.new "10.14"
+      Version.new "10.15"
     end
 
     def outdated_release?
       # TODO: bump version when new macOS is released and also update
       # references in docs/Installation.md and
       # https://github.com/Homebrew/install/blob/master/install
-      version < "10.12"
+      version < "10.13"
     end
 
     def prerelease?