diff --git a/bam_masterdata/datamodel/collection_types.py b/bam_masterdata/datamodel/collection_types.py
index e7fdae4..fa91740 100644
--- a/bam_masterdata/datamodel/collection_types.py
+++ b/bam_masterdata/datamodel/collection_types.py
@@ -1,4 +1,7 @@
-from bam_masterdata.metadata.definitions import CollectionTypeDef, PropertyTypeAssignment
+from bam_masterdata.metadata.definitions import (
+    CollectionTypeDef,
+    PropertyTypeAssignment,
+)
 from bam_masterdata.metadata.entities import CollectionType