diff --git a/vs4win/Chapter09/WorkingWithSerialization/WorkingWithSerialization.csproj b/vs4win/Chapter09/WorkingWithSerialization/WorkingWithSerialization.csproj
index 92ae860..08d3b2f 100644
--- a/vs4win/Chapter09/WorkingWithSerialization/WorkingWithSerialization.csproj
+++ b/vs4win/Chapter09/WorkingWithSerialization/WorkingWithSerialization.csproj
@@ -7,12 +7,12 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
-	<ItemGroup>
-		<Using Include="System.Console" Static="true" />
-	</ItemGroup>
+  <ItemGroup>
+    <Using Include="System.Console" Static="true" />
+  </ItemGroup>
 
-	<ItemGroup>
-		<PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
-	</ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+  </ItemGroup>
 
 </Project>