diff --git a/CITATION.cff b/CITATION.cff
index 5f09a98..23fec6c 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -31,5 +31,5 @@ keywords:
   - spectroscopy
   - deshima
 license: MIT
-version: 2024.8.0
+version: 2024.9.0
 date-released: '2024-08-06'
diff --git a/README.md b/README.md
index 71001b3..93ca771 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ DESHIMA merge code for observed datasets
 ## Installation
 
 ```shell
-pip install demerge==2024.8.0
+pip install demerge==2024.9.0
 ```
 
 ## Command line interface
diff --git a/demerge/__init__.py b/demerge/__init__.py
index 788ae7b..c7d73d8 100644
--- a/demerge/__init__.py
+++ b/demerge/__init__.py
@@ -1,5 +1,5 @@
 __all__ = ["data", "demerge", "merge", "reduce"]
-__version__ = "2024.8.0"
+__version__ = "2024.9.0"
 
 
 # standard library
diff --git a/pyproject.toml b/pyproject.toml
index f2f8c92..986522f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "demerge"
-version = "2024.8.0"
+version = "2024.9.0"
 description = "DESHIMA merge code for observed datasets"
 authors = [
     "Tatsuya Takekoshi <tatsuya.takekoshi@gmail.com>",