diff --git a/pyproject.toml b/pyproject.toml
index c5dcb4a29759cca2dd4271e6113742baed4b28d3..09cfc2fc3f4e32a08e1644922afc916767313c31 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -50,7 +50,7 @@ profile = "black"
 github_url = "https://github.com/kreuzert/jupyterhub-unicorespawner"
 
 [tool.tbump.version]
-current = "0.0.12"
+current = "0.9.0"
 regex = '''
   (?P<major>\d+)
   \.
diff --git a/unicorespawner/_version.py b/unicorespawner/_version.py
index ea1871b566cbd62d5d8185ecf37fdb571783fa44..111aa1ea15568672e718f6588a11e325d0c79a85 100644
--- a/unicorespawner/_version.py
+++ b/unicorespawner/_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__ = "0.0.12"
+__version__ = "0.9.0"