diff --git a/backend/app/utils/threemf_tools.py b/backend/app/utils/threemf_tools.py
index 7667c6973..9987d4ba0 100644
--- a/backend/app/utils/threemf_tools.py
+++ b/backend/app/utils/threemf_tools.py
@@ -10,7 +10,7 @@ import math
 import re
 import zipfile
 from pathlib import Path
-from xml.etree import ElementTree as ET
+import defusedxml.ElementTree as ET
 
 # Default filament properties
 DEFAULT_FILAMENT_DIAMETER = 1.75  # mm