diff --git a/SingleAppInstance/SingleAppInstance.csproj b/SingleAppInstance/SingleAppInstance.csproj
index 58e9527..b4c9706 100644
--- a/SingleAppInstance/SingleAppInstance.csproj
+++ b/SingleAppInstance/SingleAppInstance.csproj
@@ -9,5 +9,6 @@
   <ItemGroup>
     <PackageReference Include="ktsu.AppDataStorage" />
     <PackageReference Include="ktsu.Semantics.Paths" />
+  <PackageReference Include="Polyfill" VersionOverride="9.7.2" />
   </ItemGroup>
 </Project>