diff --git a/Library/Homebrew/os/mac/xcode.rb b/Library/Homebrew/os/mac/xcode.rb
index 1b8c962401..5cf40277d5 100644
--- a/Library/Homebrew/os/mac/xcode.rb
+++ b/Library/Homebrew/os/mac/xcode.rb
@@ -162,7 +162,7 @@ module OS
       def latest_version
         case MacOS.version
         when "10.10" then "600.0.54"
-        when "10.9"  then "503.0.40"
+        when "10.9"  then "600.0.51"
         when "10.8"  then "503.0.40"
         else
           "425.0.28"