diff --git a/zzre.sourcegen/zzre.sourcegen.csproj b/zzre.sourcegen/zzre.sourcegen.csproj
index 8c3331d8..9928e5a0 100644
--- a/zzre.sourcegen/zzre.sourcegen.csproj
+++ b/zzre.sourcegen/zzre.sourcegen.csproj
@@ -10,7 +10,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.8.0" PrivateAssets="all" />
     <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.4" PrivateAssets="all" />
-    <PackageReference Include="Polyfill" Version="4.2.0">
+    <PackageReference Include="Polyfill" Version="5.2.2">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>