diff --git a/src/Yoh.Text.Json.NamingPolicies.csproj b/src/Yoh.Text.Json.NamingPolicies.csproj
index a89463e..cdd99f5 100644
--- a/src/Yoh.Text.Json.NamingPolicies.csproj
+++ b/src/Yoh.Text.Json.NamingPolicies.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
-     <PackageReference Include="System.Text.Json" Version="8.0.4" />
+     <PackageReference Include="System.Text.Json" Version="9.0.0" />
   </ItemGroup>
   <ItemGroup>
      <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All"/>