diff --git a/pyproject.toml b/pyproject.toml
index 368fd97..d90078d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -67,7 +67,7 @@ omit = [
 github_url = "https://github.com/jupyterhub/the-littlest-jupyterhub"
 
 [tool.tbump.version]
-current = "1.0.0"
+current = "1.0.1.dev"
 regex = '''
     (?P<major>\d+)
     \.
diff --git a/setup.py b/setup.py
index 347b618..4c22da6 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@ from setuptools import find_packages, setup
 
 setup(
     name="the-littlest-jupyterhub",
-    version="1.0.0",
+    version="1.0.1.dev",
     description="A small JupyterHub distribution",
     url="https://github.com/jupyterhub/the-littlest-jupyterhub",
     author="Jupyter Development Team",