diff --git a/pyproject.toml b/pyproject.toml
index 1c12f6a..f16394a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -157,7 +157,10 @@ asyncio_default_fixture_loop_scope = "function"
 asyncio_mode = "auto"
 
 [tool.mypy]
+python_version = "3.9"
 exclude = "tests/"
 plugins = ["pydantic.mypy"]
-strict = true
+# Start with non-strict mode, and swtich to strict mode later.
+# strict = true
 disable_error_code = ["import-not-found", "import-untyped", "unused-ignore"]
+follow_imports = "skip"