diff --git a/test/benchmark.js b/test/benchmark.js
index bfe5b38..4be1afd 100644
--- a/test/benchmark.js
+++ b/test/benchmark.js
@@ -1,4 +1,4 @@
-var sys = require('sys'),
+var util = require('util'),
     fs = require('fs'),
     assert = require('assert'),
     iptrie = require('iptrie');
@@ -17,20 +17,20 @@ fs.readFile(process.argv[2], 'utf-8', function(err, data) {
         count++;
       }
       catch(e) {
-        sys.puts(e,m);
+        util.puts(e,m);
       }
     }
   }
   var elapsed = (+(new Date()) - start)/1000.0;
-  sys.puts(count + " entries in " + elapsed + " seconds ");
-  sys.puts(count/elapsed + " add/sec");
+  util.puts(count + " entries in " + elapsed + " seconds ");
+  util.puts(count/elapsed + " add/sec");
 
   var timelookup = function(ip, cnt) {
     if(!cnt) cnt = 100000;
     var start = +(new Date());
     for(var i=0; i<cnt; i++) lookup.find(ip);
     var elapsed = (+(new Date()) - start)/1000.0;
-    sys.puts(ip + " performance: " + cnt/elapsed + " lookups/sec");
+    util.puts(ip + " performance: " + cnt/elapsed + " lookups/sec");
   };
   timelookup('66.225.209.7');
   timelookup('199.15.227.10');
diff --git a/test/t.js b/test/t.js
index 8925e41..1849b3d 100644
--- a/test/t.js
+++ b/test/t.js
@@ -1,4 +1,4 @@
-var sys = require('sys'),
+var util = require('util'),
     fs = require('fs'),
     assert = require('assert'),
     iptrie = require('iptrie');
@@ -27,7 +27,7 @@ fs.readFile("test/test.cidr", 'utf-8', function(err, data) {
         count++;
       }
       catch(e) {
-        sys.puts(e,m);
+        util.puts(e,m);
       }
     }
   }