diff --git a/pyproject.toml b/pyproject.toml
index 7fc63a1..62348c8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "autosar"
-version = "0.5.3"
+version = "0.5.4a1"
 description = "A set of Python modules for working with AUTOSAR XML files"
 readme = "README.md"
 requires-python = ">=3.10"