diff --git a/outpostspawner/_version.py b/outpostspawner/_version.py
index 04a8d2a8ad6de151c4daca1e585bdc41eaa0e435..5cba04623ca748d79d89f3ef31c72cdd5ae16960 100644
--- a/outpostspawner/_version.py
+++ b/outpostspawner/_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__ = "0.0.27"
+__version__ = "0.0.28"
diff --git a/pyproject.toml b/pyproject.toml
index e17139c0c50ca8bfeaede7245aa1c40d519659f6..2a6608c0a6ef7aed7f5c697bfc98cf8f3ccec27e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -50,7 +50,7 @@ profile = "black"
 github_url = "https://github.com/kreuzert/jupyterhub-outpostspawner"
 
 [tool.tbump.version]
-current = "0.0.27"
+current = "0.0.28"
 regex = '''
   (?P<major>\d+)
   \.