diff --git a/docs/source/_static/rest-api.yml b/docs/source/_static/rest-api.yml
index 93ccf69c..836543d0 100644
--- a/docs/source/_static/rest-api.yml
+++ b/docs/source/_static/rest-api.yml
@@ -6,7 +6,7 @@ info:
   description: The REST API for JupyterHub
   license:
     name: BSD-3-Clause
-  version: 4.0.1
+  version: 4.1.0.dev
 servers:
   - url: /hub/api
 security:
diff --git a/jupyterhub/_version.py b/jupyterhub/_version.py
index c2c7674e..95f2026a 100644
--- a/jupyterhub/_version.py
+++ b/jupyterhub/_version.py
@@ -2,7 +2,7 @@
 # Copyright (c) Jupyter Development Team.
 # Distributed under the terms of the Modified BSD License.
 # version_info updated by running `tbump`
-version_info = (4, 0, 1, "", "")
+version_info = (4, 1, 0, "", "dev")
 
 # pep 440 version: no dot before beta/rc, but before .dev
 # 0.1.0rc1
diff --git a/pyproject.toml b/pyproject.toml
index f58903fd..af83201f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,7 +43,7 @@ target_version = [
 github_url = "https://github.com/jupyterhub/jupyterhub"
 
 [tool.tbump.version]
-current = "4.0.1"
+current = "4.1.0.dev"
 
 # Example of a semver regexp.
 # Make sure this matches current_version before