diff --git a/src/ApprovalTests/ApprovalTests.csproj b/src/ApprovalTests/ApprovalTests.csproj
index 9fb3c193..ba0928b7 100644
--- a/src/ApprovalTests/ApprovalTests.csproj
+++ b/src/ApprovalTests/ApprovalTests.csproj
@@ -9,7 +9,7 @@
   </PropertyGroup>
   <ItemGroup>
     <Using Remove="System.Net.Http" />
-    <PackageReference Include="Polyfill" Version="1.27.2" PrivateAssets="all" />
+    <PackageReference Include="Polyfill" Version="1.28.0" PrivateAssets="all" />
     <Compile Include="..\ApprovalUtilities\InternalsVisibleTo.cs" Link="InternalsVisibleTo.cs" />
     <PackageReference Include="DiffEngine" Version="12.2.1" />
     <PackageReference Include="EmptyFiles" Version="4.5.0" PrivateAssets="None" />