diff --git a/nerfacc/vol_rendering.py b/nerfacc/vol_rendering.py
index 2f36dab4..e39e9570 100644
--- a/nerfacc/vol_rendering.py
+++ b/nerfacc/vol_rendering.py
@@ -21,7 +21,7 @@ def rendering(
     t_ends: torch.Tensor,
     # rendering options
     early_stop_eps: float = 1e-4,
-    alpha_thre: float = 1e-2,
+    alpha_thre: float = 0.0,
     render_bkgd: Optional[torch.Tensor] = None,
 ) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor]:
     """Render the rays through the radience field defined by `rgb_sigma_fn`.
diff --git a/pyproject.toml b/pyproject.toml
index df808c29..8d0729f2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "nerfacc"
-version = "0.1.5"
+version = "0.1.6"
 description = "A General NeRF Acceleration Toolbox."
 readme = "README.md"
 authors = [{name = "Ruilong", email = "ruilongli94@gmail.com"}]