diff --git a/FolderDiffIL4DotNet.Core/FolderDiffIL4DotNet.Core.csproj b/FolderDiffIL4DotNet.Core/FolderDiffIL4DotNet.Core.csproj
index 890ce3ec..390011f2 100644
--- a/FolderDiffIL4DotNet.Core/FolderDiffIL4DotNet.Core.csproj
+++ b/FolderDiffIL4DotNet.Core/FolderDiffIL4DotNet.Core.csproj
@@ -37,7 +37,7 @@
   <ItemGroup>
     <!-- Nerdbank.GitVersioning: version derived from version.json / version.json からバージョンを自動算出 -->
     <PackageReference Include="Nerdbank.GitVersioning" Version="3.10.94" PrivateAssets="All" />
-    <PackageReference Include="System.Text.Encoding.CodePages" Version="10.0.11" />
+    <PackageReference Include="System.Text.Encoding.CodePages" Version="10.0.12" />
   </ItemGroup>
 
 </Project>