diff --git a/jupyter_server_proxy/_version.py b/jupyter_server_proxy/_version.py
index 2f672eaf..05ed41cf 100644
--- a/jupyter_server_proxy/_version.py
+++ b/jupyter_server_proxy/_version.py
@@ -1,4 +1,4 @@
 # __version__ should be updated using tbump, based on configuration in
 # pyproject.toml, according to instructions in RELEASE.md.
 #
-__version__ = "4.4.0"
+__version__ = "4.4.1-0.dev"
diff --git a/labextension/package.json b/labextension/package.json
index 312699f5..53dd0f4d 100644
--- a/labextension/package.json
+++ b/labextension/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@jupyterhub/jupyter-server-proxy",
-  "version": "4.4.0",
+  "version": "4.4.1-0.dev",
   "description": "A JupyterLab extension accompanying the PyPI package jupyter-server-proxy adding launcher items for configured server processes.",
   "keywords": [
     "jupyter",
diff --git a/pyproject.toml b/pyproject.toml
index e068e766..9334e5e6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,7 @@ requires = [
 #
 [project]
 name = "jupyter_server_proxy"
-version = "4.4.0"
+version = "4.4.1-0.dev"
 description = "A Jupyter server extension to run additional processes and proxy to them that comes bundled JupyterLab extension to launch pre-defined processes."
 keywords = ["jupyter", "jupyterlab", "jupyterlab-extension"]
 authors = [
@@ -162,7 +162,7 @@ profile = "black"
 github_url = "https://github.com/jupyterhub/jupyter-server-proxy"
 
 [tool.tbump.version]
-current = "4.4.0"
+current = "4.4.1-0.dev"
 regex = '''
     (?P<major>\d+)
     \.