diff --git a/Excel_Adapter/Excel_Adapter.csproj b/Excel_Adapter/Excel_Adapter.csproj
index 95d58cf..4a755d7 100644
--- a/Excel_Adapter/Excel_Adapter.csproj
+++ b/Excel_Adapter/Excel_Adapter.csproj
@@ -87,7 +87,7 @@
     <PackageReference Include="ExcelNumberFormat" Version="1.1.0" />
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
     <PackageReference Include="SixLabors.Fonts" Version="1.0.0" />
-    <PackageReference Include="System.IO.Packaging" Version="8.0.0" />
+    <PackageReference Include="System.IO.Packaging" Version="6.0.0" />
     <PackageReference Include="System.Security.AccessControl" Version="6.0.2-mauipre.1.22102.15" />
     <PackageReference Include="System.Security.Permissions" Version="8.0.0" />
   </ItemGroup>