diff --git a/Library/Homebrew/macos.rb b/Library/Homebrew/macos.rb
index 2d378932cc..e94ba62c93 100644
--- a/Library/Homebrew/macos.rb
+++ b/Library/Homebrew/macos.rb
@@ -204,6 +204,7 @@ module MacOS extend self
     "4.5.1" => { :llvm_build => 2336, :clang => "4.1", :clang_build => 421 },
     "4.5.2" => { :llvm_build => 2336, :clang => "4.1", :clang_build => 421 },
     "4.6"   => { :llvm_build => 2336, :clang => "4.2", :clang_build => 425 },
+    "4.6.1" => { :llvm_build => 2336, :clang => "4.2", :clang_build => 425 },
   }
 
   def compilers_standard?
diff --git a/Library/Homebrew/os/mac/xcode.rb b/Library/Homebrew/os/mac/xcode.rb
index 0bb68636a1..40bc1e87d6 100644
--- a/Library/Homebrew/os/mac/xcode.rb
+++ b/Library/Homebrew/os/mac/xcode.rb
@@ -23,7 +23,7 @@ module MacOS::Xcode extend self
       when 10.6 then "3.2.6"
     else
       if MacOS.version >= 10.7
-        "4.6"
+        "4.6.1"
       else
         raise "Mac OS X `#{MacOS.version}' is invalid"
       end
@@ -155,7 +155,7 @@ module MacOS::CLT extend self
 
   def latest_version?
     `/usr/bin/clang --version` =~ %r{clang-(\d+)\.(\d+)\.(\d+)}
-    $1.to_i >= 425 and $3.to_i >= 24
+    $1.to_i >= 425 and $3.to_i >= 27
   end
 
   def version