diff --git a/pyproject.toml b/pyproject.toml
index b2a7d97fc..5eada9d77 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,7 @@ build-backend = "setuptools.build_meta"
 github_url = "https://github.com/zeromq/pyzmq"
 
 [tool.tbump.version]
-current = "23.0.0.dev"
+current = "23.0.0b1"
 regex = '''
   (?P<major>\d+)
   \.
diff --git a/setup.py b/setup.py
index 290330841..444546eb9 100755
--- a/setup.py
+++ b/setup.py
@@ -1320,7 +1320,7 @@ def find_packages():
 
 setup_args = dict(
     name="pyzmq",
-    version="23.0.0.dev",
+    version="23.0.0b1",
     packages=find_packages(),
     ext_modules=extensions,
     cffi_modules=cffi_modules,
diff --git a/zmq/sugar/version.py b/zmq/sugar/version.py
index a1feb7cd3..643b3bce8 100644
--- a/zmq/sugar/version.py
+++ b/zmq/sugar/version.py
@@ -8,7 +8,7 @@
 
 from zmq.backend import zmq_version_info
 
-__version__: str = "23.0.0.dev"
+__version__: str = "23.0.0b1"
 _version_pat = re.compile(r"(\d+)\.(\d+)\.(\d+)(.*)")
 _match = cast(Match, _version_pat.match(__version__))
 _version_groups = _match.groups()