diff --git a/src/DemaConsulting.VersionMark/DemaConsulting.VersionMark.csproj b/src/DemaConsulting.VersionMark/DemaConsulting.VersionMark.csproj
index b44b2ee..8fe49be 100644
--- a/src/DemaConsulting.VersionMark/DemaConsulting.VersionMark.csproj
+++ b/src/DemaConsulting.VersionMark/DemaConsulting.VersionMark.csproj
@@ -67,7 +67,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <!-- Polyfill is a source-only package; contentfiles delivers the polyfill source into this project -->
-    <PackageReference Include="Polyfill" Version="9.12.0">
+    <PackageReference Include="Polyfill" Version="9.13.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>