diff --git a/src/EnumUtilities/EnumUtilities.csproj b/src/EnumUtilities/EnumUtilities.csproj
index 61d434e..db4d41a 100644
--- a/src/EnumUtilities/EnumUtilities.csproj
+++ b/src/EnumUtilities/EnumUtilities.csproj
@@ -16,7 +16,7 @@
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+    <PackageReference Include="Polyfill" Version="2.1.0">
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