diff --git a/Formula/yarn.rb b/Formula/yarn.rb
index 1000551e28..1e0099857b 100644
--- a/Formula/yarn.rb
+++ b/Formula/yarn.rb
@@ -3,10 +3,15 @@ require "language/node"
 class Yarn < Formula
   desc "Javascript package manager"
   homepage "https://yarnpkg.com/"
-  url "https://yarnpkg.com/downloads/0.18.0/yarn-v0.18.0.tar.gz"
-  sha256 "8fb1843d2a1283972ff5fead9d6c9f9002de793ecec6dfec7abec908403ecd19"
+  url "https://yarnpkg.com/downloads/0.17.10/yarn-v0.17.10.tar.gz"
+  sha256 "592140a9d387a892935ca49ee93a8207b95073e2b732693987420dd1a7606672"
   head "https://github.com/yarnpkg/yarn.git"
 
+  devel do
+    url "https://yarnpkg.com/downloads/0.18.0/yarn-v0.18.0.tar.gz"
+    sha256 "8fb1843d2a1283972ff5fead9d6c9f9002de793ecec6dfec7abec908403ecd19"
+  end
+
   bottle do
     cellar :any_skip_relocation
     sha256 "1f85dfe3f763dea1ad3b54d02d3109b44876bb9a47625d19df5678a256ab23f4" => :sierra