diff --git a/src/ProtocolGateway.IotHubClient/packages.config b/src/ProtocolGateway.IotHubClient/packages.config
index b22f68b0..57d9b223 100644
--- a/src/ProtocolGateway.IotHubClient/packages.config
+++ b/src/ProtocolGateway.IotHubClient/packages.config
@@ -49,7 +49,7 @@
   <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.Tasks.Extensions" version="4.5.1" targetFramework="net451" />