diff --git a/NetLicensingClient/src/main/java/com/labs64/netlicensing/util/XMLDSigValidatorCustom.java b/NetLicensingClient/src/main/java/com/labs64/netlicensing/util/XMLDSigValidatorCustom.java
index 24355a5..bb52a0a 100644
--- a/NetLicensingClient/src/main/java/com/labs64/netlicensing/util/XMLDSigValidatorCustom.java
+++ b/NetLicensingClient/src/main/java/com/labs64/netlicensing/util/XMLDSigValidatorCustom.java
@@ -1,6 +1,7 @@
 package com.labs64.netlicensing.util;
 
 import java.security.Key;
+import java.util.Objects;
 
 import javax.xml.crypto.KeySelector;
 import javax.xml.crypto.dsig.XMLSignature;
@@ -10,7 +11,6 @@
 import org.w3c.dom.Element;
 import org.w3c.dom.NodeList;
 
-import com.helger.base.enforce.ValueEnforcer;
 import com.helger.xmldsig.XMLDSigSetup;
 import com.helger.xmldsig.XMLDSigValidationResult;
 import com.helger.xmldsig.XMLDSigValidator;
@@ -48,7 +48,7 @@ public static XMLDSigValidationResult validateSignature(final Document aDoc)
      */
     public static XMLDSigValidationResult validateSignature(final Document aDoc, final Key aKey)
             throws XMLSignatureException {
-        ValueEnforcer.notNull(aDoc, "Document");
+        Objects.requireNonNull(aDoc, "Document");
 
         // Find Signature element.
         final NodeList aSignatureNL = aDoc.getElementsByTagNameNS(XMLSignature.XMLNS, XMLDSigSetup.ELEMENT_SIGNATURE);