diff --git a/masterthermconnect/__version__.py b/masterthermconnect/__version__.py
index 7d66844..587c9a7 100644
--- a/masterthermconnect/__version__.py
+++ b/masterthermconnect/__version__.py
@@ -1,3 +1,3 @@
 """Python API wrapper for Mastertherm Connect."""
 
-__version__ = "2.2.8"
+__version__ = "2.2.9b0"
diff --git a/pyproject.toml b/pyproject.toml
index 283a7c8..4272407 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "masterthermconnect"
-version = "2.2.8"
+version = "2.2.9b0"
 description = "Python 3 API wrapper for Mastertherm API"
 readme = "README.md"
 authors = [{ name = "Richard Holmes", email = "richard@shedc.uk" }]
@@ -28,7 +28,7 @@ Homepage = "https://github.com/sHedC/python-masterthermconnect"
 masterthermconnect = "masterthermconnect.__main__:main"
 
 [tool.bumpver]
-current_version = "2.2.8"
+current_version = "2.2.9-b0"
 version_pattern = "MAJOR.MINOR.PATCH[-PYTAGNUM]"
 commit_message = "bump version {old_version} -> {new_version}"
 commit = true