diff --git a/pyproject.toml b/pyproject.toml
index af797c3..a076c70 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,7 +40,6 @@ path = "asdf_pydantic/__version__.py"
 
 # Default Environment
 [tool.hatch.envs.default]
-python = "3.9"
 dependencies = [
   "ipython",
   "pytest",