diff --git a/customtkinter/__init__.py b/customtkinter/__init__.py
index 77a97e8..cfed45c 100644
--- a/customtkinter/__init__.py
+++ b/customtkinter/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "3.12.0"
+__version__ = "4.0.0"
 
 import os
 import sys
diff --git a/pyproject.toml b/pyproject.toml
index 5683f6b..b400fd2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ build-backend = "setuptools.build_meta"
 github_url = "https://github.com/TomSchimansky/CustomTkinter"
 
 [tool.tbump.version]
-current = "3.12.0"
+current = "4.0.0"
 
 # Example of a semver regexp.
 # Make sure this matches current_version before
diff --git a/setup.cfg b/setup.cfg
index 792a787..a547a25 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = customtkinter
-version = 3.12.0
+version = 4.0.0
 description = Create modern looking GUIs with tkinter and Python
 long_description = file: README.md
 long_description_content_type = text/markdown