diff --git a/pyproject.toml b/pyproject.toml
index 175c288..e51d67f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,7 +14,7 @@ dependencies = ["pandas>=2.0", "tzdata>=2024.1", "click>=8.0"]
 easy-tdx = "easy_tdx.cli:cli"  # cli/__init__.py exposes the click group
 
 [project.optional-dependencies]
-dev = ["pytest>=8.0", "pytest-cov", "mypy>=1.9", "ruff>=0.4"]
+dev = ["pytest>=8.0", "pytest-asyncio>=0.23", "pytest-cov", "mypy>=1.9", "ruff>=0.4"]
 
 [tool.hatch.build.targets.wheel]
 packages = ["src/easy_tdx"]
@@ -41,6 +41,7 @@ select = ["E", "F", "I", "UP"]
 [tool.pytest.ini_options]
 testpaths = ["tests"]
 addopts = "--tb=short"
+asyncio_mode = "auto"
 
 [tool.coverage.run]
 source = ["easy_tdx"]