diff --git a/Library/Homebrew/macos.rb b/Library/Homebrew/macos.rb
index ab3fe76d54..d0f2d40f74 100644
--- a/Library/Homebrew/macos.rb
+++ b/Library/Homebrew/macos.rb
@@ -206,6 +206,7 @@ module MacOS extend self
     "4.6"   => { :llvm_build => 2336, :clang => "4.2", :clang_build => 425 },
     "4.6.1" => { :llvm_build => 2336, :clang => "4.2", :clang_build => 425 },
     "4.6.2" => { :llvm_build => 2336, :clang => "4.2", :clang_build => 425 },
+    "4.6.3" => { :llvm_build => 2336, :clang => "4.2", :clang_build => 425 },
     "5.0"   => { :clang => "5.0", :clang_build => 500 },
   }
 
diff --git a/Library/Homebrew/os/mac/xcode.rb b/Library/Homebrew/os/mac/xcode.rb
index 873275fcce..eaae6fbf88 100644
--- a/Library/Homebrew/os/mac/xcode.rb
+++ b/Library/Homebrew/os/mac/xcode.rb
@@ -22,7 +22,7 @@ module MacOS::Xcode extend self
     when 10.4       then "2.5"
     when 10.5       then "3.1.4"
     when 10.6       then "3.2.6"
-    when 10.7, 10.8 then "4.6.2"
+    when 10.7, 10.8 then "4.6.3"
     when 10.9       then "5.0"
     else
       # Default to newest known version of Xcode for unreleased OSX versions.