diff --git a/docs/sphinx/manual/en/source/conf.py b/docs/sphinx/manual/en/source/conf.py
index e796f837..3f51d973 100644
--- a/docs/sphinx/manual/en/source/conf.py
+++ b/docs/sphinx/manual/en/source/conf.py
@@ -32,9 +32,9 @@
 author = "PHYSBO developers"
 
 # The short X.Y version.
-version = "1.1"
+version = "2.0"
 # The full version, including alpha/beta/rc tags.
-release = "1.1.1"
+release = "2.0.0"
 
 # for jupyter-notebook
 
diff --git a/docs/sphinx/manual/ja/source/conf.py b/docs/sphinx/manual/ja/source/conf.py
index 0b1c1bdc..52c17190 100644
--- a/docs/sphinx/manual/ja/source/conf.py
+++ b/docs/sphinx/manual/ja/source/conf.py
@@ -26,9 +26,9 @@
 author = "PHYSBO developers"
 
 # The short X.Y version.
-version = "1.1"
+version = "2.0"
 # The full version, including alpha/beta/rc tags.
-release = "1.1.1"
+release = "2.0.0"
 
 # -- General configuration ---------------------------------------------------
 
diff --git a/physbo/__init__.py b/physbo/__init__.py
index 39457b79..55c2c2f9 100644
--- a/physbo/__init__.py
+++ b/physbo/__init__.py
@@ -14,4 +14,4 @@
 from .predictor import base_predictor
 from .variable import variable
 
-__version__ = "1.1.1"
+__version__ = "2.0.0"
diff --git a/setup.cfg b/setup.cfg
index a279db0b..f00b5744 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = physbo
-version = 1.2-dev
+version = 2.0.0
 description = optimization tool for PHYSics based on Bayesian Optimization
 long_description = file: README.md
 long_description_content_type = text/markdown