diff --git a/jsc_custom/_version.py b/jsc_custom/_version.py
index 6a824015b9380ddb37a93dba7a0d28bcf3060359..5e3b13ed084b6278a7a53748a31decb94f05bbb1 100644
--- a/jsc_custom/_version.py
+++ b/jsc_custom/_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__ = "0.12.27"
+__version__ = "0.12.28"
diff --git a/pyproject.toml b/pyproject.toml
index 15ddabecd1a170555a63b45486bf00a4905f0ef5..80416738bedcb0f5896d83a5f9d1584992b31962 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -56,7 +56,7 @@ profile = "black"
 github_url = "https://github.com/kreuzert/jupyter-jsc-custom"
 
 [tool.tbump.version]
-current = "0.12.27"
+current = "0.12.28"
 regex = '''
   (?P<major>\d+)
   \.