diff --git a/CHANGELOG.md b/CHANGELOG.md
index a9b4818..4cc5c12 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,12 @@
+# 5.3.3 (2025-12-16)
+
+## Bugfixes
+
+- fix type designator handling in `RDFLibLoader.from_rdf_graph`. This fixes an
+  issue where subclasses of ranges, e.g. `dlidentifiers:Identifier`, were not
+  properly handled.
+
+
 # 5.3.2 (2025-12-15)
 
 ## Bugfixes
diff --git a/dump_things_service/__about__.py b/dump_things_service/__about__.py
index c5a1bad..578d5bd 100644
--- a/dump_things_service/__about__.py
+++ b/dump_things_service/__about__.py
@@ -1 +1 @@
-__version__ = '5.3.2'
+__version__ = '5.3.3'
diff --git a/dump_things_service/patches/rdflib_loader.py b/dump_things_service/patches/rdflib_loader.py
index feb1499..f43f228 100644
--- a/dump_things_service/patches/rdflib_loader.py
+++ b/dump_things_service/patches/rdflib_loader.py
@@ -125,8 +125,9 @@ def from_rdf_graph(
                 logger.info(f'Replacing {subject_class} with {type_classes}')
                 subject_class = type_classes[0].name
                 # PATCH >>>>>
-                if type_classes[0].class_uri is not None:
-                    dict_obj[type_designator_slot.name] = type_classes[0].class_uri
+                type_class_iri = schemaview.get_uri(type_classes[0])
+                if type_class_iri is not None:
+                    dict_obj[type_designator_slot.name] = type_class_iri
                 # PATCH <<<<<
         # process all triples for this node
         for (_, p, o) in graph.triples((subject, None, None)):