diff --git a/pyproject.toml b/pyproject.toml
index 12ad577..e867518 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "lang-main"
-version = "0.1.0a14"
+version = "0.1.0a21"
 description = "Several tools to analyse TOM's data with strong focus on language processing"
 authors = [
     {name = "d-opt GmbH, resp. Florian Förster", email = "f.foerster@d-opt.com"},
@@ -154,7 +154,7 @@ directory = "reports/coverage"
 
 
 [tool.bumpversion]
-current_version = "0.1.0a14"
+current_version = "0.1.0a21"
 parse = """(?x)
     (?P<major>0|[1-9]\\d*)\\.
     (?P<minor>0|[1-9]\\d*)\\.