diff --git a/catalog/common/jsondata.py b/catalog/common/jsondata.py
index 920fa2e3..7a396411 100644
--- a/catalog/common/jsondata.py
+++ b/catalog/common/jsondata.py
@@ -231,7 +231,7 @@ def to_json(self, value: datetime | date | str):
                 v = dateparse.parse_date(value)
                 if v is None:
                     raise ValueError(
-                        "DateTimeField: '{value}' has invalid datatime format"
+                        f"DateTimeField: '{value}' has invalid datatime format"
                     )
                 value = v
             if isinstance(value, date):
diff --git a/neodb-takahe b/neodb-takahe
index 32bb393a..df6f939a 160000
--- a/neodb-takahe
+++ b/neodb-takahe
@@ -1 +1 @@
-Subproject commit 32bb393a29d5d9dade1e2378dd240ca6d56cc3a6
+Subproject commit df6f939a73512ac8a8c01e0e78bc0d5e8ffe3e6d