diff --git a/docs/en/source/conf.py b/docs/en/source/conf.py
index 592f32b..8a1e164 100644
--- a/docs/en/source/conf.py
+++ b/docs/en/source/conf.py
@@ -62,9 +62,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '1.0.0'
+version = '1.1'
 # The full version, including alpha/beta/rc tags.
-release = '1.0.0'
+release = '1.1-dev'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/docs/ja/source/conf.py b/docs/ja/source/conf.py
index 80266df..2965c16 100644
--- a/docs/ja/source/conf.py
+++ b/docs/ja/source/conf.py
@@ -62,9 +62,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '1.0.0'
+version = '1.1'
 # The full version, including alpha/beta/rc tags.
-release = '1.0.0'
+release = '1.1-dev'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/pyproject.toml b/pyproject.toml
index 74f0c13..885ca85 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "hwave"
-version = "1.0.0"
+version = "1.1-dev"
 description = "UHF"
 authors = ["H-Wave developers <hwave-dev@issp.u-tokyo.ac.jp>"]
 license = "GPL-3.0-or-later"
diff --git a/src/hwave/__init__.py b/src/hwave/__init__.py
index 5becc17..52f9831 100644
--- a/src/hwave/__init__.py
+++ b/src/hwave/__init__.py
@@ -1 +1 @@
-__version__ = "1.0.0"
+__version__ = "1.1-dev"