diff --git a/Formula/shyaml.rb b/Formula/shyaml.rb
index 71831c4003..a33b54f73d 100644
--- a/Formula/shyaml.rb
+++ b/Formula/shyaml.rb
@@ -5,7 +5,7 @@ class Shyaml < Formula
   homepage "https://github.com/0k/shyaml"
   url "https://files.pythonhosted.org/packages/67/70/1133a5817bc62ff4e7ceee59edb95d127092db9385cc7cda5fcac93c494a/shyaml-0.4.1.tar.gz"
   sha256 "a1535c25bf0058563e03ea8cbad8c4dc755ed231e6a9f3f584982994f19eae59"
-  revision 2
+  revision 3
 
   head "https://github.com/0k/shyaml.git"
 
@@ -16,6 +16,7 @@ class Shyaml < Formula
   end
 
   depends_on :python3
+  depends_on "libyaml"
 
   resource "PyYAML" do
     url "https://files.pythonhosted.org/packages/4a/85/db5a2df477072b2902b0eb892feb37d88ac635d36245a72a6a69b23b383a/PyYAML-3.12.tar.gz"