diff --git a/AppDataStorage/AppDataStorage.csproj b/AppDataStorage/AppDataStorage.csproj
index c2f34a6..ca7fd51 100644
--- a/AppDataStorage/AppDataStorage.csproj
+++ b/AppDataStorage/AppDataStorage.csproj
@@ -8,6 +8,7 @@
     <PackageReference Include="ktsu.CaseConverter" />
     <PackageReference Include="ktsu.RoundTripStringJsonConverter" />
     <PackageReference Include="ktsu.Semantics.Paths" />
+  <PackageReference Include="Polyfill" />
     <PackageReference Include="TestableIO.System.IO.Abstractions" />
     <PackageReference Include="TestableIO.System.IO.Abstractions.Wrappers" />
   </ItemGroup>
diff --git a/Directory.Packages.props b/Directory.Packages.props
index 49ee835..afee565 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -11,6 +11,7 @@
     <PackageVersion Include="Microsoft.Testing.Extensions.CodeCoverage" Version="18.3.2" />
     <PackageVersion Include="MSTest.TestAdapter" Version="4.0.2" />
     <PackageVersion Include="MSTest.TestFramework" Version="4.0.2" />
+    <PackageVersion Include="Polyfill" Version="9.7.1" />
     <PackageVersion Include="TestableIO.System.IO.Abstractions" Version="22.1.0" />
     <PackageVersion Include="TestableIO.System.IO.Abstractions.TestingHelpers" Version="22.1.0" />
     <PackageVersion Include="TestableIO.System.IO.Abstractions.Wrappers" Version="22.1.0" />