diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index 3541fbd8..af8c6289 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 3.9.2
+current_version = 4.0.0-a0
 commit = True
 parse = (?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+)(\-(?P<release>.*)(?P<build>\d+))?
 serialize = 
diff --git a/custom_components/spotcast/__init__.py b/custom_components/spotcast/__init__.py
index 0a97d92d..68dc3d08 100644
--- a/custom_components/spotcast/__init__.py
+++ b/custom_components/spotcast/__init__.py
@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-__version__ = "3.9.2"
+__version__ = "4.0.0-a0"
 
 import collections
 import logging
diff --git a/custom_components/spotcast/manifest.json b/custom_components/spotcast/manifest.json
index 6fcb1d22..d58ebab4 100644
--- a/custom_components/spotcast/manifest.json
+++ b/custom_components/spotcast/manifest.json
@@ -18,5 +18,5 @@
     "requirements": [
         "spotipy==2.23.0"
     ],
-    "version": "v3.9.2"
+    "version": "v4.0.0-a0"
 }
diff --git a/setup.cfg b/setup.cfg
index 0f86d651..c7d37e59 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 3.9.2
+current_version = 4.0.0-a0
 
 [flake8]
 exclude = .venv,.git,.tox,docs,venv,bin,lib,deps,build