diff --git a/sdk/python/pyproject.toml b/sdk/python/pyproject.toml
index f5129cbf93..ace943dd10 100644
--- a/sdk/python/pyproject.toml
+++ b/sdk/python/pyproject.toml
@@ -30,7 +30,12 @@ Repository = "https://github.com/openai/codex"
 Issues = "https://github.com/openai/codex/issues"
 
 [project.optional-dependencies]
-dev = ["pytest>=8.0", "datamodel-code-generator==0.31.2", "ruff>=0.11"]
+dev = [
+  "pytest>=8.0",
+  "datamodel-code-generator==0.31.2",
+  "ruff>=0.11",
+  "tomli>=2.0; python_version < '3.11'",
+]
 
 [tool.hatch.build]
 exclude = [
diff --git a/sdk/python/tests/test_artifact_workflow_and_binaries.py b/sdk/python/tests/test_artifact_workflow_and_binaries.py
index 2cebd3a272..5d950a4718 100644
--- a/sdk/python/tests/test_artifact_workflow_and_binaries.py
+++ b/sdk/python/tests/test_artifact_workflow_and_binaries.py
@@ -10,6 +10,11 @@ from pathlib import Path
 
 import pytest
 
+try:
+    import tomllib
+except ModuleNotFoundError:  # pragma: no cover - Python 3.10 fallback.
+    import tomli as tomllib
+
 ROOT = Path(__file__).resolve().parents[1]
 
 
@@ -223,7 +228,7 @@ def test_release_metadata_retries_without_invalid_auth(monkeypatch: pytest.Monke
 
 
 def test_runtime_package_is_wheel_only_and_builds_platform_specific_wheels() -> None:
-    pyproject_text = (ROOT.parent / "python-runtime" / "pyproject.toml").read_text()
+    pyproject = tomllib.loads((ROOT.parent / "python-runtime" / "pyproject.toml").read_text())
     hook_source = (ROOT.parent / "python-runtime" / "hatch_build.py").read_text()
     hook_tree = ast.parse(hook_source)
     initialize_fn = next(
@@ -263,12 +268,14 @@ def test_runtime_package_is_wheel_only_and_builds_platform_specific_wheels() ->
         and isinstance(node.value, ast.Constant)
     }
 
-    assert "[tool.hatch.build.targets.wheel]" in pyproject_text
-    assert 'packages = ["src/codex_cli_bin"]' in pyproject_text
-    assert 'include = ["src/codex_cli_bin/bin/**"]' in pyproject_text
-    assert "[tool.hatch.build.targets.wheel.hooks.custom]" in pyproject_text
-    assert "[tool.hatch.build.targets.sdist]" in pyproject_text
-    assert "[tool.hatch.build.targets.sdist.hooks.custom]" in pyproject_text
+    assert pyproject["tool"]["hatch"]["build"]["targets"]["wheel"] == {
+        "packages": ["src/codex_cli_bin"],
+        "include": ["src/codex_cli_bin/bin/**"],
+        "hooks": {"custom": {}},
+    }
+    assert pyproject["tool"]["hatch"]["build"]["targets"]["sdist"] == {
+        "hooks": {"custom": {}},
+    }
     assert sdist_guard is not None
     assert build_data_assignments == {"pure_python": False, "infer_tag": True}