diff --git a/Samples/Stylet.Samples.ModelValidation/packages.config b/Samples/Stylet.Samples.ModelValidation/packages.config
index eb4adab..ad42a63 100644
--- a/Samples/Stylet.Samples.ModelValidation/packages.config
+++ b/Samples/Stylet.Samples.ModelValidation/packages.config
@@ -31,7 +31,7 @@
   <package id="System.Runtime.Numerics" version="4.3.0" targetFramework="net45" />
   <package id="System.Text.Encoding" version="4.3.0" targetFramework="net45" />
   <package id="System.Text.Encoding.Extensions" version="4.3.0" targetFramework="net45" />
-  <package id="System.Text.RegularExpressions" version="4.3.0" targetFramework="net45" />
+  <package id="System.Text.RegularExpressions" version="4.3.1" targetFramework="net45" />
   <package id="System.Threading" version="4.3.0" targetFramework="net45" />
   <package id="System.Threading.Tasks" version="4.3.0" targetFramework="net45" />
   <package id="System.ValueTuple" version="4.5.0" targetFramework="net45" />