diff --git a/example/example.js b/example/example.js
index 30e8ab0..61f0cd6 100755
--- a/example/example.js
+++ b/example/example.js
@@ -1,15 +1,15 @@
 var rdf2json = require("../lib/rdf2json");
-var sys = require("sys");
+var util = require('util');
 rdf2json.convertFileIntoRDFJSON("./test/wine.rdf", "flat", function(err, rdfjson){
-    if(err) sys.puts("Something wrong here ...");
+    if(err) util.puts("Something wrong here ...");
 	var obj = eval("("+ rdfjson +")");
-	sys.puts(JSON.stringify(obj));
+	util.puts(JSON.stringify(obj));
 });
 
 rdf2json.convertURLIntoRDFJSON("http://www.w3.org/TR/owl-guide/wine.rdf", "sparql", function(err, rdfjson){
-	if(err) sys.puts("Something wrong here ...");
+	if(err) util.puts("Something wrong here ...");
     var obj = eval("("+ rdfjson +")");
-	sys.puts(JSON.stringify(obj));
+	util.puts(JSON.stringify(obj));
 });
 
 rdf2json.convertStringIntoRDFJSON("" +
@@ -44,5 +44,5 @@ rdf2json.convertStringIntoRDFJSON("" +
 	"	</owl:Ontology>" +
 	"</rdf:RDF>", "talis", function(err, rdfjson){
 		var obj = eval("("+ rdfjson +")");
-		sys.puts(JSON.stringify(obj));
+		util.puts(JSON.stringify(obj));
 });
\ No newline at end of file
diff --git a/test/test.js b/test/test.js
index 5b22112..fb0e5ff 100755
--- a/test/test.js
+++ b/test/test.js
@@ -1,6 +1,6 @@
 var rdf2json = require("../lib/rdf2json");
 var jsunit = require("mjsunit");
-var sys = require("sys");
+var util = require('util');
 
 function testConvertStringIntoRDFJSON(){
 	rdf2json.convertStringIntoRDFJSON("" +
@@ -34,7 +34,7 @@ function testConvertStringIntoRDFJSON(){
 			"		<rdfs:label>Wine Ontology</rdfs:label>" +
 			"	</owl:Ontology>" +
 			"</rdf:RDF>", "flat", function(err, rdfjson){
-        if(err) sys.puts("Something wrong here ...");
+        if(err) util.puts("Something wrong here ...");
 		jsunit.assertNotNull("The generated flat RDF/JSON string should not be null", rdfjson);
 		var jsonobj = eval("("+ rdfjson +")");
 		jsunit.assertNotNull("The flat RDF/JSON object should not be null", jsonobj);
@@ -89,7 +89,7 @@ function testConvertStringIntoRDFJSON(){
 			"		<rdfs:label>Wine Ontology</rdfs:label>" +
 			"	</owl:Ontology>" +
 			"</rdf:RDF>", "sparql", function(err, rdfjson){
-        if(err) sys.puts("Something wrong here ...");
+        if(err) util.puts("Something wrong here ...");
 		jsunit.assertNotNull("The generated SPARQL RDF/JSON string should not be null", rdfjson);
 		var jsonobj = eval("("+ rdfjson +")");
 		jsunit.assertNotNull("The SPARQL RDF/JSON object should not be null", jsonobj);
@@ -98,7 +98,7 @@ function testConvertStringIntoRDFJSON(){
 
 function testConvertFileIntoRDFJSON(){
 	rdf2json.convertFileIntoRDFJSON("../wine.rdf", "sparql", function(err, rdfjson){
-        if(err) sys.puts("Something wrong here ...");
+        if(err) util.puts("Something wrong here ...");
 		jsunit.assertNotNull("The generated SPARQL RDF/JSON string should not be null", rdfjson);
 		var jsonobj = eval("("+ rdfjson +")");
 		jsunit.assertNotNull("The SPARQL RDF/JSON object should not be null", jsonobj);
@@ -145,7 +145,7 @@ function testConvertStringIntoRDFJSON(){
 			"		<rdfs:label>Wine Ontology</rdfs:label>" +
 			"	</owl:Ontology>" +
 			"</rdf:RDF>", "talis", function(err, rdfjson){
-        if(err) sys.puts("Something wrong here ...");
+        if(err) util.puts("Something wrong here ...");
 		jsunit.assertNotNull("The generated Talis RDF/JSON string should not be null", rdfjson);
 		var jsonobj = eval("("+ rdfjson +")");
 		jsunit.assertNotNull("The Talis RDF/JSON object should not be null", jsonobj);
@@ -154,7 +154,7 @@ function testConvertStringIntoRDFJSON(){
 
 function testConvertFileIntoRDFJSON(){
 	rdf2json.convertFileIntoRDFJSON("../wine.rdf", "talis", function(err, rdfjson){
-        if(err) sys.puts("Something wrong here ...");
+        if(err) util.puts("Something wrong here ...");
 		jsunit.assertNotNull("The generated Talis RDF/JSON string should not be null", rdfjson);
 		var jsonobj = eval("("+ rdfjson +")");
 		jsunit.assertNotNull("The Talis RDF/JSON object should not be null", jsonobj);
@@ -163,7 +163,7 @@ function testConvertFileIntoRDFJSON(){
 
 function testConvertURLIntoRDFJSON(){
 	rdf2json.convertURLIntoRDFJSON("http://www.w3.org/TR/owl-guide/wine.rdf", "talis", function(err, rdfjson){
-        if(err) sys.puts("Something wrong here ...");
+        if(err) util.puts("Something wrong here ...");
 		jsunit.assertNotNull("The generated Talis RDF/JSON string should not be null", rdfjson);
 		var jsonobj = eval("("+ rdfjson +")");
 		jsunit.assertNotNull("The Talis RDF/JSON object should not be null", jsonobj);