diff --git a/wazp/callbacks/metadata.py b/wazp/callbacks/metadata.py
index 5d33275..1cf074a 100644
--- a/wazp/callbacks/metadata.py
+++ b/wazp/callbacks/metadata.py
@@ -661,7 +661,9 @@ def generate_yaml_files_from_spreadsheet(
 
             # convert all fields in dataframe to strings
             # (otherwise datetime fields are not encoded correctly in the YAML)
-            df = df.applymap(str)
+            df = df.applymap(str)  # type: ignore[operator]
+            # TODO: remove ignore comment 👆 if we update the linter job to 3.11
+            #       with newer pandas-stubs
 
             # check if columns in spreadsheet match metadata file:
             # if not, add missing columns