diff --git a/Formula/rswift.rb b/Formula/rswift.rb
index 6f44ce34c9..f7d0a0adfb 100644
--- a/Formula/rswift.rb
+++ b/Formula/rswift.rb
@@ -2,8 +2,8 @@ class Rswift < Formula
   desc "Get strong typed, autocompleted resources like images, fonts and segues"
   homepage "https://github.com/mac-cain13/R.swift"
   url "https://github.com/mac-cain13/R.swift.git",
-      :tag => "v3.3.0",
-      :revision => "d341d73f6009553717d5a0e8d813c21dc9f11e31"
+      :tag => "v4.0.0",
+      :revision => "0306ec185ad0f7753e9ea44fefdbf268d9e62184"
 
   bottle do
     cellar :any_skip_relocation
@@ -11,11 +11,11 @@ class Rswift < Formula
     sha256 "79999cf741147dc10697f8354a14a43d060d0ac6ba352e7887b685ac8ca90c79" => :el_capitan
   end
 
-  depends_on :xcode => "8.0"
+  depends_on :xcode => "9.0"
 
   def install
-    ENV["CC"] = which(ENV.cc)
-    system "swift", "build", "-c", "release", "-Xswiftc", "-static-stdlib"
+    system "swift", "build", "--disable-sandbox", "-c", "release", "-Xswiftc",
+           "-static-stdlib"
     bin.install ".build/release/rswift"
   end