diff --git a/aas_test_engines/__init__.py b/aas_test_engines/__init__.py
index f697be5..ac1e1ac 100644
--- a/aas_test_engines/__init__.py
+++ b/aas_test_engines/__init__.py
@@ -1,2 +1,2 @@
 def version() -> str:
-    return "1.4.0"
+    return "0.6.0"
diff --git a/pyproject.toml b/pyproject.toml
index 2515b1b..fa7cca2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "aas_test_engines"
-version = "1.4.0"
+version = "0.6.0"
 description = "Official test tooling for the Asset Administration Shell"
 readme = "README.md"
 classifiers = [