diff --git a/pyproject.toml b/pyproject.toml
index 3fd6c93..f0a3901 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -56,7 +56,7 @@ filterwarnings = [
 github_url = "https://github.com/jupyterhub/systemdspawner"
 
 [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 d1c30a6..9149849 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@
 
 setup(
     name="jupyterhub-systemdspawner",
-    version="1.0.0",
+    version="1.0.1.dev",
     description="JupyterHub Spawner using systemd for resource isolation",
     long_description=long_description,
     long_description_content_type="text/markdown",