diff --git a/src/ProDotNetZipNetStandard.csproj b/src/ProDotNetZipNetStandard.csproj
index a3765dd..cd781e2 100644
--- a/src/ProDotNetZipNetStandard.csproj
+++ b/src/ProDotNetZipNetStandard.csproj
@@ -34,8 +34,8 @@
 	</PropertyGroup>
 
 	<ItemGroup>
-		<PackageReference Include="System.Security.Permissions" Version="9.0.0" />
-		<PackageReference Include="System.Text.Encoding.CodePages" Version="9.0.0" />
+		<PackageReference Include="System.Security.Permissions" Version="8.0.0" />
+		<PackageReference Include="System.Text.Encoding.CodePages" Version="8.0.0" />
 	</ItemGroup>
 
 	<ItemGroup>