diff --git a/Directory.Packages.props b/Directory.Packages.props
index d7213f849..8b812c79a 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -42,6 +42,7 @@
     <PackageVersion Include="Microsoft.Data.OData" Version="5.8.5" />
     <PackageVersion Include="Microsoft.WindowsAzure.ConfigurationManager" Version="3.2.1" />
     <PackageVersion Include="System.Spatial" Version="5.8.5" />
+    <PackageVersion Include="System.Text.RegularExpressions" Version="4.3.1" />
     <PackageVersion Include="WindowsAzure.ServiceBus" Version="4.1.3" />
   </ItemGroup>
   
diff --git a/test/DurableTask.AzureStorage.Tests/DurableTask.AzureStorage.Tests.csproj b/test/DurableTask.AzureStorage.Tests/DurableTask.AzureStorage.Tests.csproj
index df42c925b..f0b772968 100644
--- a/test/DurableTask.AzureStorage.Tests/DurableTask.AzureStorage.Tests.csproj
+++ b/test/DurableTask.AzureStorage.Tests/DurableTask.AzureStorage.Tests.csproj
@@ -52,6 +52,7 @@
   </ItemGroup>
 
   <ItemGroup>
+    <PackageReference Include="System.Text.RegularExpressions" />
     <None Update="large.jpeg">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>