diff --git a/samples/MultiProjectSolution/tests/RevitAddin.Tests/RevitAddin.Tests.csproj b/samples/MultiProjectSolution/tests/RevitAddin.Tests/RevitAddin.Tests.csproj
index e7cab85..236637e 100644
--- a/samples/MultiProjectSolution/tests/RevitAddin.Tests/RevitAddin.Tests.csproj
+++ b/samples/MultiProjectSolution/tests/RevitAddin.Tests/RevitAddin.Tests.csproj
@@ -11,7 +11,7 @@
         <PackageReference Include="Nice3point.Revit.Api.RevitAPI" Version="$(RevitVersion).*"/>
         <PackageReference Include="Nice3point.TUnit.Revit" Version="$(RevitVersion).*"/>
         <PackageReference Include="TUnit" Version="1.18.21"/>
-        <PackageReference Include="Polyfill" Version="9.8.1"/>
+        <PackageReference Include="Polyfill" Version="9.18.0"/>
     </ItemGroup>
 
     <ItemGroup>
diff --git a/source/Nice3point.Revit.Sdk/Nice3point.Revit.Sdk.csproj b/source/Nice3point.Revit.Sdk/Nice3point.Revit.Sdk.csproj
index 232b3dd..68c31f1 100644
--- a/source/Nice3point.Revit.Sdk/Nice3point.Revit.Sdk.csproj
+++ b/source/Nice3point.Revit.Sdk/Nice3point.Revit.Sdk.csproj
@@ -36,7 +36,7 @@
 
     <ItemGroup>
         <PackageReference Include="Microsoft.Build.Utilities.Core" Version="18.0.2" ExcludeAssets="Runtime"/>
-        <PackageReference Include="Polyfill" Version="9.8.1"/>
+        <PackageReference Include="Polyfill" Version="9.18.0"/>
         <PackageReference Include="JetBrains.Annotations" Version="2025.2.4"/>
     </ItemGroup>
 
diff --git a/source/Nice3point.Revit.Templates/Nice3point.Unit.Revit/Nice3point.Unit.Revit.1.csproj b/source/Nice3point.Revit.Templates/Nice3point.Unit.Revit/Nice3point.Unit.Revit.1.csproj
index dc01649..6d26862 100644
--- a/source/Nice3point.Revit.Templates/Nice3point.Unit.Revit/Nice3point.Unit.Revit.1.csproj
+++ b/source/Nice3point.Revit.Templates/Nice3point.Unit.Revit/Nice3point.Unit.Revit.1.csproj
@@ -12,7 +12,7 @@
         <PackageReference Include="Nice3point.Revit.Api.RevitAPI" Version="$(RevitVersion).*"/>
         <PackageReference Include="Nice3point.TUnit.Revit" Version="$(RevitVersion).*"/>
         <PackageReference Include="TUnit" Version="1.18.21"/>
-        <PackageReference Include="Polyfill" Version="9.8.1"/>
+        <PackageReference Include="Polyfill" Version="9.18.0"/>
     </ItemGroup>
 
 </Project>
\ No newline at end of file