diff --git a/src/caosadvancedtools/table_json_conversion/table_generator.py b/src/caosadvancedtools/table_json_conversion/table_generator.py
index 2eb48c39c96ebfc17a9192d9776d2e4e58bb229d..1e7020fbc1681caaeb56cfcd9e9c325dff24055e 100644
--- a/src/caosadvancedtools/table_json_conversion/table_generator.py
+++ b/src/caosadvancedtools/table_json_conversion/table_generator.py
@@ -272,7 +272,7 @@ class XLSXTemplateGenerator(TableTemplateGenerator):
 
         return ordered_cols
 
-    def _create_workbook_from_sheets_def(self, sheets: dict[str, dict[str, tuple[str, list]]]):
+    def _create_workbook_from_sheets_def(self, sheets: Dict[str, Dict[str, Tuple[str, list]]]):
         wb = Workbook()
         assert wb.sheetnames == ["Sheet"]
         for sn, sheetdef in sheets.items():