diff --git a/Refer.Tests/packages.config b/Refer.Tests/packages.config
index 0be23da..a3e3900 100644
--- a/Refer.Tests/packages.config
+++ b/Refer.Tests/packages.config
@@ -40,7 +40,7 @@
   <package id="System.Security.Cryptography.X509Certificates" version="4.3.0" targetFramework="net462" />
   <package id="System.Text.Encoding" version="4.3.0" targetFramework="net462" />
   <package id="System.Text.Encoding.Extensions" version="4.3.0" targetFramework="net462" />
-  <package id="System.Text.RegularExpressions" version="4.3.0" targetFramework="net462" />
+  <package id="System.Text.RegularExpressions" version="4.3.1" targetFramework="net462" />
   <package id="System.Threading" version="4.3.0" targetFramework="net462" />
   <package id="System.Threading.Tasks" version="4.3.0" targetFramework="net462" />
   <package id="System.Threading.Timer" version="4.3.0" targetFramework="net462" />