diff --git a/CITATION.cff b/CITATION.cff
index 4a68f21..098ef13 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -28,5 +28,5 @@ keywords:
   - spectroscopy
   - submillimeter
 license: MIT
-version: 2025.6.0
-date-released: '2025-06-16'
+version: 2025.6.1
+date-released: '2025-06-17'
diff --git a/README.md b/README.md
index 507840f..a2a83c4 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ DESHIMA measurement set by DataArray
 ## Installation
 
 ```shell
-pip install dems==2025.6.0
+pip install dems==2025.6.1
 ```
 
 ## Usage
diff --git a/dems/__init__.py b/dems/__init__.py
index 8117dd2..b2e28a3 100644
--- a/dems/__init__.py
+++ b/dems/__init__.py
@@ -1,5 +1,5 @@
 __all__ = ["d1", "d2"]
-__version__ = "2025.6.0"
+__version__ = "2025.6.1"
 
 
 # submodules
diff --git a/dems/d2.py b/dems/d2.py
index e61ffab..c1c0631 100644
--- a/dems/d2.py
+++ b/dems/d2.py
@@ -69,6 +69,18 @@ class Weight:
     long_name: Attr[str] = "Data weights"
 
 
+@dataclass
+class CubeMask:
+    data: Data[Tuple[Ch, Lt, Ln], bool]
+    long_name: Attr[str] = "Data masks"
+
+
+@dataclass
+class CubeWeight:
+    data: Data[Tuple[Ch, Lt, Ln], float]
+    long_name: Attr[str] = "Data weights"
+
+
 @dataclass
 class Observation:
     data: Data[Ti, Literal["U16"]]
@@ -450,6 +462,8 @@ class Cube(AsDataArray):
 
     # data
     data: Data[Tuple[Ch, Lt, Ln], Any]
+    mask: Coordof[CubeMask] = False
+    weight: Coordof[CubeWeight] = 1.0
     long_name: Attr[str] = "Brightness"
     units: Attr[str] = "K"
     name: Name[str] = "Cube"
@@ -457,8 +471,9 @@ class Cube(AsDataArray):
     chan: Coordof[Chan_] = 0
     lon: Coordof[Lon_] = 0.0
     lat: Coordof[Lat_] = 0.0
-    # data information
+    # telescope pointing
     frame: Coordof[Frame] = "altaz"
+    # data information
     bandwidth: Coordof[Bandwidth] = 0.0
     frequency: Coordof[Frequency] = 0.0
     beam_major: Coordof[BeamMajor] = 0.0
@@ -468,6 +483,9 @@ class Cube(AsDataArray):
     observer: Attr[str] = ""
     project: Attr[str] = ""
     object: Attr[str] = ""
+    telescope_name: Attr[str] = ""
+    telescope_diameter: Attr[float] = 0.0
+    telescope_coordinates: Attr[Tuple[float, float, float]] = 0.0, 0.0, 0.0
     # ASTE specific
     aste_obs_group: Attr[str] = ""
     aste_obs_id: Attr[str] = ""
diff --git a/pyproject.toml b/pyproject.toml
index 32398ca..adafa15 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "dems"
-version = "2025.6.0"
+version = "2025.6.1"
 description = "DESHIMA Measurement Set"
 readme = "README.md"
 keywords = [
@@ -35,7 +35,12 @@ homepage = "https://github.com/deshima-dev/dems"
 repository = "https://github.com/deshima-dev/dems"
 
 [dependency-groups]
-dev = ["black>=24.4", "ipython>=8.18", "pyright>=1.1", "pytest>=8.2"]
+dev = [
+    "black>=25,<26",
+    "ipython>=8,<10",
+    "pyright>=1,<2",
+    "pytest>=8,<9",
+]
 
 [build-system]
 requires = ["hatchling"]
diff --git a/uv.lock b/uv.lock
index 304b7be..bd23df5 100644
--- a/uv.lock
+++ b/uv.lock
@@ -108,7 +108,7 @@ wheels = [
 
 [[package]]
 name = "dems"
-version = "2024.7.2"
+version = "2025.6.1"
 source = { editable = "." }
 dependencies = [
     { name = "xarray-dataclasses" },
@@ -129,10 +129,10 @@ requires-dist = [{ name = "xarray-dataclasses", specifier = ">=1.8,<2.0" }]
 
 [package.metadata.requires-dev]
 dev = [
-    { name = "black", specifier = ">=24.4" },
-    { name = "ipython", specifier = ">=8.18" },
-    { name = "pyright", specifier = ">=1.1" },
-    { name = "pytest", specifier = ">=8.2" },
+    { name = "black", specifier = ">=25,<26" },
+    { name = "ipython", specifier = ">=8,<10" },
+    { name = "pyright", specifier = ">=1,<2" },
+    { name = "pytest", specifier = ">=8,<9" },
 ]
 
 [[package]]