diff --git a/lib/index.js b/lib/index.js
index e6ed6f4..f2f61e7 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -4,7 +4,7 @@
 
 var axon = require('pm2-axon');
 var cst  = require('../constants.js');
-var sys  = require('sys');
+var util  = require('util');
 var rpc  = require('pm2-axon-rpc');
 var log  = require('debug')('pm2:interface');
 var EventEmitter = require('events').EventEmitter;
@@ -120,4 +120,4 @@ var IPM2 = function(sub_port, rpc_port, bind_host) {
 
 };
 
-sys.inherits(IPM2, EventEmitter);
+util.inherits(IPM2, EventEmitter);