diff --git a/Chickensoft.Serialization.Godot.Tests/Chickensoft.Serialization.Godot.Tests.csproj b/Chickensoft.Serialization.Godot.Tests/Chickensoft.Serialization.Godot.Tests.csproj
index 56e0932..29765c0 100644
--- a/Chickensoft.Serialization.Godot.Tests/Chickensoft.Serialization.Godot.Tests.csproj
+++ b/Chickensoft.Serialization.Godot.Tests/Chickensoft.Serialization.Godot.Tests.csproj
@@ -24,7 +24,7 @@
     <PackageReference Include="LightMock.Generator" Version="1.2.2" />
     <!-- Convenience wrapper around generated mocks. -->
     <PackageReference Include="LightMoq" Version="0.1.0" />
-    <PackageReference Include="System.Text.Json" Version="8.0.4" />
+    <PackageReference Include="System.Text.Json" Version="9.0.0-rc.1.24431.7" />
   </ItemGroup>
   <ItemGroup>
     <!-- Include the package to test. -->