diff --git a/Tools/NighlightDetectionModelGenerator/NighlightDetectionModelGenerator/packages.config b/Tools/NighlightDetectionModelGenerator/NighlightDetectionModelGenerator/packages.config
index acb2935..edef2ae 100644
--- a/Tools/NighlightDetectionModelGenerator/NighlightDetectionModelGenerator/packages.config
+++ b/Tools/NighlightDetectionModelGenerator/NighlightDetectionModelGenerator/packages.config
@@ -71,7 +71,7 @@
   <package id="System.ServiceModel.Primitives" version="4.5.3" targetFramework="net471" />
   <package id="System.Text.Encoding" version="4.3.0" targetFramework="net47" />
   <package id="System.Text.Encoding.Extensions" version="4.3.0" targetFramework="net47" />
-  <package id="System.Text.RegularExpressions" version="4.3.0" targetFramework="net47" />
+  <package id="System.Text.RegularExpressions" version="4.3.1" targetFramework="net47" />
   <package id="System.Threading" version="4.3.0" targetFramework="net47" />
   <package id="System.Threading.Tasks" version="4.3.0" targetFramework="net47" />
   <package id="System.Threading.Tasks.Dataflow" version="4.9.0" targetFramework="net471" />