diff --git a/requirements.txt b/requirements.txt
index fb6c7ed..f344230 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1,3 @@
 pandas
+defusedxml
+lxml
diff --git a/src/xml-validator.py b/src/xml-validator.py
index 058669d..e0281ba 100644
--- a/src/xml-validator.py
+++ b/src/xml-validator.py
@@ -7,6 +7,7 @@
 import sys
 import xml.etree.ElementTree as ET
 from lxml import etree
+from defusedxml.lxml import parse as defused_parse
 import logging # Keep standard logging import for levels like logging.INFO
 import re
 
@@ -28,11 +29,11 @@ def validate_against_xsd(xml_file, xsd_file):
     """
     try:
         # Parse the XSD schema
-        xmlschema_doc = etree.parse(xsd_file)
+        xmlschema_doc = defused_parse(xsd_file)
         xmlschema = etree.XMLSchema(xmlschema_doc)
         
         # Parse the XML file
-        xml_doc = etree.parse(xml_file)
+        xml_doc = defused_parse(xml_file)
         
         # Validate
         is_valid = xmlschema.validate(xml_doc)