diff --git a/pyproject.toml b/pyproject.toml
index f3aa52c..30dcb50 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -52,6 +52,7 @@ packages = ["dbt"]
 path = "dbt/adapters/postgres/__version__.py"
 
 [tool.hatch.envs.default]
+python = "3.9"
 dependencies = [
     "dbt-adapters @ git+https://github.com/dbt-labs/dbt-adapters.git",
     "dbt-common @ git+https://github.com/dbt-labs/dbt-common.git",
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29