diff --git a/pandas/io/excel/_openpyxl.py b/pandas/io/excel/_openpyxl.py
index 867d11583dcc0..adc6116fcd774 100644
--- a/pandas/io/excel/_openpyxl.py
+++ b/pandas/io/excel/_openpyxl.py
@@ -610,8 +610,6 @@ def _convert_cell(self, cell) -> Scalar:
     def get_sheet_data(
         self, sheet, file_rows_needed: int | None = None
     ) -> list[list[Scalar]]:
-        if self.book.read_only:
-            sheet.reset_dimensions()
 
         data: list[list[Scalar]] = []
         last_row_with_data = -1