diff --git a/buildtools/CustomTasks/packages.config b/buildtools/CustomTasks/packages.config
index 1c58a3bb062e..6c15fd658a98 100644
--- a/buildtools/CustomTasks/packages.config
+++ b/buildtools/CustomTasks/packages.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="Newtonsoft.Json" version="7.0.1" targetFramework="net45" />
-  <package id="YamlDotNet" version="3.6.1" targetFramework="net45" />
+  <package id="YamlDotNet" version="5.1.0" targetFramework="net45" />
 </packages>
\ No newline at end of file