diff --git a/project/jsonld.py b/project/jsonld.py
index 0ea6f43..af8d238 100644
--- a/project/jsonld.py
+++ b/project/jsonld.py
@@ -16,7 +16,9 @@ class CustomJsonProvider(DefaultJSONProvider):
         elif isinstance(obj, datetime.date):
             return obj.isoformat()
 
-        return super(CustomJsonProvider, CustomJsonProvider).default(obj)  # pragma: no cover
+        return super(CustomJsonProvider, CustomJsonProvider).default(
+            obj
+        )  # pragma: no cover
 
 
 def get_sd_for_admin_unit(admin_unit):