diff --git a/src/Directory.Build.props b/src/Directory.Build.props
index 7eac2e4..49f6dd8 100644
--- a/src/Directory.Build.props
+++ b/src/Directory.Build.props
@@ -21,7 +21,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="Polyfill" Version="10.4.0" Condition="!Exists('packages.config')">
+    <PackageReference Include="Polyfill" Version="10.5.1" Condition="!Exists('packages.config')">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
diff --git a/tests/Directory.Build.props b/tests/Directory.Build.props
index 68109cf..2f73a1e 100644
--- a/tests/Directory.Build.props
+++ b/tests/Directory.Build.props
@@ -16,7 +16,7 @@
     <PackageReference Include="Shouldly" Version="4.*" />
     <PackageReference Include="Spectre.Console.Testing" Version="0.54.0" />
     <PackageReference Include="TUnit" Version="1.*" />
-    <PackageReference Include="Polyfill" Version="10.4.0">
+    <PackageReference Include="Polyfill" Version="10.5.1">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>