diff --git a/tests/test_litellm/images/test_dimensions.py b/tests/test_litellm/images/test_dimensions.py
index 122ac3862e1..b24d6f59a76 100644
--- a/tests/test_litellm/images/test_dimensions.py
+++ b/tests/test_litellm/images/test_dimensions.py
@@ -177,6 +177,11 @@ def _dims(width: int, height: int) -> ImageDimensions:
             _dims(640, 480),
             id="bmp-v4header",
         ),
+        pytest.param(
+            b"BM" + bytes(12) + struct.pack("<I", 124) + struct.pack("<ii", 640, 480) + bytes(6),
+            _dims(640, 480),
+            id="bmp-v5header",
+        ),
         pytest.param(b"II*\x00" + bytes(28), None, id="unknown-format"),
     ),
 )