diff --git a/mmdet3d/__init__.py b/mmdet3d/__init__.py
index 3fb8ca0e2b..9584e57741 100644
--- a/mmdet3d/__init__.py
+++ b/mmdet3d/__init__.py
@@ -14,8 +14,8 @@
 mmengine_maximum_version = '1.0.0'
 mmengine_version = digit_version(mmengine.__version__)
 
-mmdet_minimum_version = '3.0.0'
-mmdet_maximum_version = '3.2.0'
+mmdet_minimum_version = '3.0.0rc5'
+mmdet_maximum_version = '3.3.0'
 mmdet_version = digit_version(mmdet.__version__)
 
 assert (mmcv_version >= digit_version(mmcv_minimum_version)
diff --git a/mmdet3d/configs/_base_/__init__.py b/mmdet3d/configs/_base_/__init__.py
deleted file mode 100644
index ef101fec61..0000000000
--- a/mmdet3d/configs/_base_/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-# Copyright (c) OpenMMLab. All rights reserved.
diff --git a/mmdet3d/configs/_base_/datasets/__init__.py b/mmdet3d/configs/_base_/datasets/__init__.py
deleted file mode 100644
index ef101fec61..0000000000
--- a/mmdet3d/configs/_base_/datasets/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-# Copyright (c) OpenMMLab. All rights reserved.
diff --git a/mmdet3d/configs/_base_/models/__init__.py b/mmdet3d/configs/_base_/models/__init__.py
deleted file mode 100644
index ef101fec61..0000000000
--- a/mmdet3d/configs/_base_/models/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-# Copyright (c) OpenMMLab. All rights reserved.
diff --git a/mmdet3d/configs/_base_/schedules/__init__.py b/mmdet3d/configs/_base_/schedules/__init__.py
deleted file mode 100644
index ef101fec61..0000000000
--- a/mmdet3d/configs/_base_/schedules/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-# Copyright (c) OpenMMLab. All rights reserved.
diff --git a/mmdet3d/configs/centerpoint/__init__.py b/mmdet3d/configs/centerpoint/__init__.py
deleted file mode 100644
index ef101fec61..0000000000
--- a/mmdet3d/configs/centerpoint/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-# Copyright (c) OpenMMLab. All rights reserved.
diff --git a/mmdet3d/configs/cylinder3d/__init__.py b/mmdet3d/configs/cylinder3d/__init__.py
deleted file mode 100644
index ef101fec61..0000000000
--- a/mmdet3d/configs/cylinder3d/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-# Copyright (c) OpenMMLab. All rights reserved.
diff --git a/mmdet3d/configs/minkunet/__init__.py b/mmdet3d/configs/minkunet/__init__.py
deleted file mode 100644
index ef101fec61..0000000000
--- a/mmdet3d/configs/minkunet/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-# Copyright (c) OpenMMLab. All rights reserved.
diff --git a/mmdet3d/configs/mvxnet/__init__.py b/mmdet3d/configs/mvxnet/__init__.py
deleted file mode 100644
index ef101fec61..0000000000
--- a/mmdet3d/configs/mvxnet/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-# Copyright (c) OpenMMLab. All rights reserved.
diff --git a/mmdet3d/configs/pgd/__init__.py b/mmdet3d/configs/pgd/__init__.py
deleted file mode 100644
index ef101fec61..0000000000
--- a/mmdet3d/configs/pgd/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-# Copyright (c) OpenMMLab. All rights reserved.