diff --git a/CITATION.cff b/CITATION.cff
index 93ebb4a..8e43a96 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -33,5 +33,5 @@ keywords:
   - spectroscopy
   - submillimeter
 license: MIT
-version: 2025.6.1
-date-released: '2025-06-23'
+version: 2025.8.0
+date-released: '2025-08-18'
diff --git a/README.md b/README.md
index ee362ad..36bea73 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ DESHIMA code for data analysis
 ## Installation
 
 ```shell
-pip install decode==2025.6.1
+pip install decode==2025.8.0
 ```
 
 ## Quick look
diff --git a/decode/__init__.py b/decode/__init__.py
index b4f556c..778e381 100644
--- a/decode/__init__.py
+++ b/decode/__init__.py
@@ -11,7 +11,7 @@
     "stats",
     "utils",
 ]
-__version__ = "2025.6.1"
+__version__ = "2025.8.0"
 
 
 # submodules
diff --git a/decode/utils.py b/decode/utils.py
index 606ddf7..00d1d9e 100644
--- a/decode/utils.py
+++ b/decode/utils.py
@@ -46,6 +46,7 @@ def phaseof(
     *,
     keep_attrs: bool = False,
     keep_coords: bool = False,
+    keep_name: bool = False,
 ) -> xr.DataArray:
     """Assign a phase to each value in a 1D DataArray.
 
@@ -57,6 +58,7 @@ def phaseof(
         da: Input 1D DataArray.
         keep_attrs: Whether to keep attributes of the input.
         keep_coords: Whether to keep coordinates of the input.
+        keep_name: Whether to keep name of the input.
 
     Returns:
         1D int64 DataArray of phases.
@@ -69,4 +71,11 @@ def phaseof(
     is_transision.data[1:] = da.data[1:] != da.data[:-1]
 
     phase = is_transision.cumsum(keep_attrs=keep_attrs)
-    return phase if keep_coords else phase.reset_coords(drop=True)
+
+    if not keep_coords:
+        phase = phase.reset_coords(drop=True)
+
+    if not keep_name:
+        phase = phase.rename(None)
+
+    return phase
diff --git a/pyproject.toml b/pyproject.toml
index 096d58a..e908458 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "decode"
-version = "2025.6.1"
+version = "2025.8.0"
 description = "DESHIMA code for data analysis"
 readme = "README.md"
 keywords = [
diff --git a/uv.lock b/uv.lock
index 78d5b23..407cac0 100644
--- a/uv.lock
+++ b/uv.lock
@@ -535,7 +535,7 @@ wheels = [
 
 [[package]]
 name = "decode"
-version = "2025.6.1"
+version = "2025.8.0"
 source = { editable = "." }
 dependencies = [
     { name = "astropy", version = "6.0.1", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.10'" },