diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 4561e8a53e191..31a158c1ffd16 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -32,7 +32,7 @@ env:
   CACHE_VERSION: 5
   PIP_CACHE_VERSION: 4
   MYPY_CACHE_VERSION: 4
-  HA_SHORT_VERSION: 2023.8
+  HA_SHORT_VERSION: 2023.9
   DEFAULT_PYTHON: "3.11"
   ALL_PYTHON_VERSIONS: "['3.11']"
   # 10.3 is the oldest supported version
diff --git a/homeassistant/const.py b/homeassistant/const.py
index 513d72555a5be..a41710f128053 100644
--- a/homeassistant/const.py
+++ b/homeassistant/const.py
@@ -6,7 +6,7 @@
 
 APPLICATION_NAME: Final = "HomeAssistant"
 MAJOR_VERSION: Final = 2023
-MINOR_VERSION: Final = 8
+MINOR_VERSION: Final = 9
 PATCH_VERSION: Final = "0.dev0"
 __short_version__: Final = f"{MAJOR_VERSION}.{MINOR_VERSION}"
 __version__: Final = f"{__short_version__}.{PATCH_VERSION}"
diff --git a/pyproject.toml b/pyproject.toml
index 1f179518fd974..497a4540dda63 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name        = "homeassistant"
-version     = "2023.8.0.dev0"
+version     = "2023.9.0.dev0"
 license     = {text = "Apache-2.0"}
 description = "Open-source home automation platform running on Python 3."
 readme      = "README.rst"