Latest Xcode is 5.1.1

Library/Homebrew/os/mac/xcode.rb

@@ -12,12 +12,12 @@ module OS
         when "10.5"         then "3.1.4"
         when "10.6"         then "3.2.6"
         when "10.7"         then "4.6.3"
-        when "10.8"         then "5.1"
-        when "10.9"         then "5.1"
+        when "10.8"         then "5.1.1"
+        when "10.9"         then "5.1.1"
         else
           # Default to newest known version of Xcode for unreleased OSX versions.
           if MacOS.version > "10.9"
-            "5.1"
+            "5.1.1"
           else
             raise "Mac OS X '#{MacOS.version}' is invalid"
           end
@@ -157,7 +157,7 @@ module OS
 
       def latest_version
         if MacOS.version >= "10.8"
-          "503.0.38"
+          "503.0.40"
         else
           "425.0.28"
         end