diff --git a/csharp/UAParser.Tests/packages.config b/csharp/UAParser.Tests/packages.config
index 2d5b9838..ac8cff4a 100644
--- a/csharp/UAParser.Tests/packages.config
+++ b/csharp/UAParser.Tests/packages.config
@@ -2,5 +2,5 @@
 <packages>
   <package id="xunit" version="1.9.2" targetFramework="net40" />
   <package id="xunit.extensions" version="1.9.2" targetFramework="net40" />
-  <package id="YamlDotNet" version="3.0.0" targetFramework="net40" />
+  <package id="YamlDotNet" version="5.1.0" targetFramework="net40" />
 </packages>
\ No newline at end of file