diff --git a/pyproject.toml b/pyproject.toml
index 119133fdd..7690bd969 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ build-backend = "setuptools.build_meta"
 github_url = "https://github.com/zeromq/pyzmq"
 
 [tool.tbump.version]
-current = "25.0.1"
+current = "25.1.0.dev"
 regex = '''
   (?P<major>\d+)
   \.
diff --git a/setup.py b/setup.py
index 12314b5ae..47ee34eb2 100755
--- a/setup.py
+++ b/setup.py
@@ -1322,7 +1322,7 @@ def find_packages():
 
 setup_args = dict(
     name="pyzmq",
-    version="25.0.1",
+    version="25.1.0.dev",
     packages=find_packages(),
     ext_modules=extensions,
     cffi_modules=cffi_modules,
diff --git a/zmq/sugar/version.py b/zmq/sugar/version.py
index c4f3724a0..658e5e401 100644
--- a/zmq/sugar/version.py
+++ b/zmq/sugar/version.py
@@ -8,7 +8,7 @@
 
 from zmq.backend import zmq_version_info
 
-__version__: str = "25.0.1"
+__version__: str = "25.1.0.dev"
 _version_pat = re.compile(r"(\d+)\.(\d+)\.(\d+)(.*)")
 _match = cast(Match, _version_pat.match(__version__))
 _version_groups = _match.groups()