diff --git a/Formula/heroku-toolbelt.rb b/Formula/heroku-toolbelt.rb
index f771be2b0e8..91d11500ca8 100644
--- a/Formula/heroku-toolbelt.rb
+++ b/Formula/heroku-toolbelt.rb
@@ -1,9 +1,36 @@
 require 'formula'
 
+class Ruby19 < Requirement
+  fatal true
+  default_formula 'ruby'
+
+  satisfy :build_env => false do
+    next unless which 'ruby'
+    version = /\d\.\d/.match `ruby --version 2>&1`
+
+    next unless version
+    Version.new(version.to_s) >= Version.new("1.9")
+  end
+
+  def modify_build_environment
+    ruby = which "ruby"
+    return unless ruby
+
+    ENV.prepend_path "PATH", ruby.dirname
+  end
+
+  def message; <<-EOS.undent
+    The Heroku Toolbelt requires Ruby >= 1.9
+    EOS
+  end
+end
+
 class HerokuToolbelt < Formula
   homepage 'https://toolbelt.heroku.com/other'
-  url 'http://assets.heroku.com.s3.amazonaws.com/heroku-client/heroku-client-3.3.0.tgz'
-  sha1 '5c4760414623b3e92bb0deaf5d49da695f8c7ad4'
+  url 'http://assets.heroku.com.s3.amazonaws.com/heroku-client/heroku-client-3.7.2.tgz'
+  sha1 'c8907404c959e0f23e9fd0cf2adb7e7dfe281c77'
+
+  depends_on Ruby19
 
   def install
     libexec.install Dir["*"]