diff --git a/openeo_pg_parser_networkx/pg_schema.py b/openeo_pg_parser_networkx/pg_schema.py
index fa48c43..d79813d 100644
--- a/openeo_pg_parser_networkx/pg_schema.py
+++ b/openeo_pg_parser_networkx/pg_schema.py
@@ -95,6 +95,7 @@ class ProcessNode(BaseModel, arbitrary_types_allowed=True):
                 list,
                 dict,
                 str,
+                None,
             ],
             Field(union_mode='left_to_right'),
         ],
diff --git a/pyproject.toml b/pyproject.toml
index d20c959..6f5f1d1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "openeo-pg-parser-networkx"
-version = "2024.7.0"
+version = "2024.10.0"
 
 description = "Parse OpenEO process graphs from JSON to traversible Python objects."
 authors = ["Lukas Weidenholzer <lukas.weidenholzer@eodc.eu>", "Sean Hoyal <sean.hoyal@eodc.eu>", "Valentina Hutter <valentina.hutter@eodc.eu>", "Gerald Irsiegler <gerald.irsiegler@eodc.eu>"]