diff --git a/src/Humanizer/Humanizer.csproj b/src/Humanizer/Humanizer.csproj
index 09e2d6f56..c7fc536cb 100644
--- a/src/Humanizer/Humanizer.csproj
+++ b/src/Humanizer/Humanizer.csproj
@@ -15,7 +15,7 @@
   </PropertyGroup>
   <ItemGroup>
     <Using Remove="System.Net.Http" />
-    <PackageReference Include="Polyfill" Version="4.9.0" PrivateAssets="all" />
+    <PackageReference Include="Polyfill" Version="5.0.0" PrivateAssets="all" />
     <PackageReference Include="System.Collections.Immutable" Version="8.0.0" Condition="'$(TargetFramework)' != 'net8.0'" />
     <PackageReference Include="System.ValueTuple" Version="4.5.0" Condition="$(TargetFramework.StartsWith('net46')) or (TargetFramework) != '.NETStandard'" />
     <PackageReference Include="System.Memory" Version="4.5.5" Condition="$(TargetFramework) != '.NETStandard' or $(TargetFrameworkIdentifier) == '.NETFramework'" />