diff --git a/Chickensoft.Serialization.Godot.Tests/Chickensoft.Serialization.Godot.Tests.csproj b/Chickensoft.Serialization.Godot.Tests/Chickensoft.Serialization.Godot.Tests.csproj
index eb2ad8e..601e85a 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="8.0.5" />
+    <PackageReference Include="System.Text.Json" Version="9.0.0" />
   </ItemGroup>
   <ItemGroup>
     <!-- Include the package to test. -->
diff --git a/global.json b/global.json
index e0ab56f..831654d 100644
--- a/global.json
+++ b/global.json
@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "8.0.404",
+    "version": "9.0.100",
     "rollForward": "latestMajor"
   },
   "msbuild-sdks": {