diff --git a/single-line-diagram-core/src/main/java/com/powsybl/sld/util/DomUtil.java b/single-line-diagram-core/src/main/java/com/powsybl/sld/util/DomUtil.java
index 3394a61ed..c46758001 100644
--- a/single-line-diagram-core/src/main/java/com/powsybl/sld/util/DomUtil.java
+++ b/single-line-diagram-core/src/main/java/com/powsybl/sld/util/DomUtil.java
@@ -10,7 +10,6 @@
 import com.powsybl.commons.exceptions.UncheckedTransformerException;
 import org.w3c.dom.Document;
 
-import javax.xml.XMLConstants;
 import javax.xml.parsers.DocumentBuilder;
 import javax.xml.parsers.DocumentBuilderFactory;
 import javax.xml.parsers.ParserConfigurationException;
@@ -33,8 +32,6 @@ private DomUtil() {
     public static DocumentBuilder getDocumentBuilder() {
         try {
             DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
-            dbf.setAttribute(XMLConstants.ACCESS_EXTERNAL_DTD, "");
-            dbf.setAttribute(XMLConstants.ACCESS_EXTERNAL_SCHEMA, "");
             return dbf.newDocumentBuilder();
         } catch (ParserConfigurationException e) {
             throw new UncheckedParserConfigurationException(e);
@@ -46,8 +43,6 @@ public static void transformDocument(Document document, Writer writer) {
             DOMSource source = new DOMSource(document);
             StreamResult result = new StreamResult(writer);
             TransformerFactory transformerFactory = TransformerFactory.newInstance();
-            transformerFactory.setAttribute(XMLConstants.ACCESS_EXTERNAL_DTD, "");
-            transformerFactory.setAttribute(XMLConstants.ACCESS_EXTERNAL_STYLESHEET, "");
             Transformer transformer = transformerFactory.newTransformer();
             transformer.setOutputProperty(OutputKeys.INDENT, "yes");
             transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");