diff --git a/Sources/Ditch.Ethereum.Tests/packages.config b/Sources/Ditch.Ethereum.Tests/packages.config
index f3f1b744..0c475021 100644
--- a/Sources/Ditch.Ethereum.Tests/packages.config
+++ b/Sources/Ditch.Ethereum.Tests/packages.config
@@ -23,7 +23,7 @@
   <package id="System.Security.Cryptography.X509Certificates" version="4.3.2" targetFramework="net47" />
   <package id="System.Security.Permissions" version="4.5.0" targetFramework="net47" />
   <package id="System.Security.Principal.Windows" version="4.5.1" 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.Timer" version="4.3.0" targetFramework="net47" />
   <package id="WebSocket4Net" version="0.15.2" targetFramework="net47" />