diff --git a/src/Verify.WinForms/Verify.WinForms.csproj b/src/Verify.WinForms/Verify.WinForms.csproj
index 15cacbef..64d29cdd 100644
--- a/src/Verify.WinForms/Verify.WinForms.csproj
+++ b/src/Verify.WinForms/Verify.WinForms.csproj
@@ -5,7 +5,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Argon" Version="0.14.0" />
-    <PackageReference Include="Polyfill" Version="1.33.2" PrivateAssets="all" />
+    <PackageReference Include="Polyfill" Version="1.34.0" PrivateAssets="all" />
     <PackageReference Include="Verify" Version="22.8.0" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All" Condition="$(Configuration) == 'Release'" />
     <PackageReference Include="ProjectDefaults" Version="1.0.107" PrivateAssets="all" />