diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index 055ef832..be697d15 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,9 +1,9 @@
 [bumpversion]
-current_version = 0.3.5
+current_version = 0.4.0
 commit = True
 tag = True
 parse = (?P<major>\d+)(\.(?P<minor>\d+))?(\.(?P<patch>\d+))?((?P<cycle>(a|b|rc))(?P<pre>\d+))?(\.post(?P<post>\d+))?(\.dev(?P<dev>\d+))?(\+(?P<local>.+))?
-serialize =
+serialize = 
 	{major}.{minor}.{patch}{cycle}{pre}.post{post}.dev{dev}+{local}
 	{major}.{minor}.{patch}{cycle}{pre}.post{post}.dev{dev}
 	{major}.{minor}.{patch}{cycle}{pre}.post{post}+{local}
@@ -22,7 +22,7 @@ serialize =
 	{major}.{minor}.{patch}
 
 [bumpversion:part:cycle]
-values =
+values = 
 	final
 	a
 	b
diff --git a/koapy/__init__.py b/koapy/__init__.py
index 914b75b0..2ee3acf6 100644
--- a/koapy/__init__.py
+++ b/koapy/__init__.py
@@ -2,7 +2,7 @@
 
 __author__ = """Yunseong Hwang"""
 __email__ = "kika1492@gmail.com"
-__version__ = "0.3.5"
+__version__ = "0.4.0"
 
 from koapy.backend.daishin_cybos_plus.core.CybosPlusEntrypoint import (
     CybosPlusEntrypoint,
diff --git a/pyproject.toml b/pyproject.toml
index a88368fa..7bb3fa56 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "koapy"
-version = "0.3.5"
+version = "0.4.0"
 description = "Kiwoom Open Api Plus Python"
 license = "MIT OR Apache-2.0 OR GPL-3.0-or-later"
 authors = ["Yunseong Hwang <kika1492@gmail.com>"]
diff --git a/setup.py b/setup.py
index 3abc6a2f..8886fcc9 100644
--- a/setup.py
+++ b/setup.py
@@ -112,6 +112,6 @@
     include_package_data=True,
     test_suite="tests",
     url="https://github.com/elbakramer/koapy",
-    version="0.3.5",
+    version="0.4.0",
     zip_safe=False,
 )
diff --git a/tests/test_koapy.py b/tests/test_koapy.py
index 6e327c78..ac14fb6c 100644
--- a/tests/test_koapy.py
+++ b/tests/test_koapy.py
@@ -2,4 +2,4 @@
 
 
 def test_version():
-    assert __version__ == "0.3.5"
+    assert __version__ == "0.4.0"