diff --git a/Formula/heroku.rb b/Formula/heroku.rb
index 197e9831da..b1ac9560fa 100644
--- a/Formula/heroku.rb
+++ b/Formula/heroku.rb
@@ -1,7 +1,7 @@
 class Heroku < Formula
   desc "Everything you need to get started with Heroku"
   homepage "https://cli.heroku.com"
-  url "http://cli-assets.heroku.com/branches/stable/5.6.1-0976cf3/heroku-v5.6.1-0976cf3-darwin-amd64.tar.xz"
+  url "https://cli-assets.heroku.com/branches/stable/5.6.1-0976cf3/heroku-v5.6.1-0976cf3-darwin-amd64.tar.xz"
   version "5.6.1-0976cf3"
   sha256 "27994f23258ef21c0e40b9fa21fc24b5fcabc44c697c07bf2883fb9b6fc65869"