diff --git a/CSharp/packages.config b/CSharp/packages.config
index b77a6e9..bd8d5bd 100644
--- a/CSharp/packages.config
+++ b/CSharp/packages.config
@@ -105,7 +105,7 @@
   <package id="System.Security.Cryptography.X509Certificates" version="4.3.0" targetFramework="net46" />
   <package id="System.Text.Encoding" version="4.3.0" targetFramework="net46" />
   <package id="System.Text.Encoding.Extensions" version="4.3.0" targetFramework="net46" />
-  <package id="System.Text.RegularExpressions" version="4.3.0" targetFramework="net46" />
+  <package id="System.Text.RegularExpressions" version="4.3.1" targetFramework="net46" />
   <package id="System.Threading" version="4.3.0" targetFramework="net46" />
   <package id="System.Threading.Tasks" version="4.3.0" targetFramework="net46" />
   <package id="System.Xml.ReaderWriter" version="4.3.0" targetFramework="net46" />