diff --git a/Core.Test/packages.config b/Core.Test/packages.config
index 8bed14b..6131dc1 100644
--- a/Core.Test/packages.config
+++ b/Core.Test/packages.config
@@ -34,7 +34,7 @@
   <package id="System.Runtime.Numerics" version="4.3.0" targetFramework="net451" />
   <package id="System.Text.Encoding" version="4.3.0" targetFramework="net451" />
   <package id="System.Text.Encoding.Extensions" version="4.3.0" targetFramework="net451" />
-  <package id="System.Text.RegularExpressions" version="4.3.0" targetFramework="net451" />
+  <package id="System.Text.RegularExpressions" version="4.3.1" targetFramework="net451" />
   <package id="System.Threading" version="4.3.0" targetFramework="net451" />
   <package id="System.Threading.Tasks" version="4.3.0" targetFramework="net451" />
   <package id="System.Threading.Timer" version="4.3.0" targetFramework="net451" />