diff --git a/VERSION_NUMBER b/VERSION_NUMBER
index 47e00e5f2e0..b50dd27dd92 100644
--- a/VERSION_NUMBER
+++ b/VERSION_NUMBER
@@ -1 +1 @@
-1.13.1rc2
+1.13.1
diff --git a/onnx/reference/ops/op_string_normalizer.py b/onnx/reference/ops/op_string_normalizer.py
index f65f1c1252a..3a62ee95411 100644
--- a/onnx/reference/ops/op_string_normalizer.py
+++ b/onnx/reference/ops/op_string_normalizer.py
@@ -87,7 +87,8 @@ def _run_column(  # type: ignore
                 pylocale.setlocale(pylocale.LC_ALL, slocale)
             except pylocale.Error as e:
                 warnings.warn(
-                    f"Unknown local setting {slocale!r} (current: {pylocale.getlocale()!r}) - {e!r}."
+                    f"Unknown local setting {slocale!r} (current: {pylocale.getlocale()!r}) - {e!r}.",
+                    stacklevel=2,
                 )
         cout[:] = cin[:]