diff --git a/constants.js b/constants.js
index 48d7a9a09..3bbcb07cb 100644
--- a/constants.js
+++ b/constants.js
@@ -8,7 +8,6 @@ var debug  = require('debug')('pm2:conf');
 var p      = require('path');
 var util   = require('util');
 var chalk  = require('chalk');
-var semver = require('semver');
 
 /**
  * Get PM2 path structure
@@ -79,10 +78,7 @@ var csts = {
 
   // Concurrent actions when doing start/restart/reload
   CONCURRENT_ACTIONS      : (function() {
-    var default_concurrent_actions = 1;
-    if (semver.satisfies(process.versions.node, '>= 4.0.0'))
-      default_concurrent_actions = 2;
-    var concurrent_actions = parseInt(process.env.PM2_CONCURRENT_ACTIONS) || default_concurrent_actions;
+    var concurrent_actions = parseInt(process.env.PM2_CONCURRENT_ACTIONS) || 2;
     debug('Using %d parallelism (CONCURRENT_ACTIONS)', concurrent_actions);
     return concurrent_actions;
   })(),
diff --git a/lib/API/Containerizer.js b/lib/API/Containerizer.js
index 28f4d5728..686edfd1d 100644
--- a/lib/API/Containerizer.js
+++ b/lib/API/Containerizer.js
@@ -4,7 +4,6 @@ var exec    = require('child_process').exec;
 var chalk   = require('chalk');
 var util    = require('util');
 var fmt     = require('../tools/fmt.js');
-var vizion  = require('vizion');
 var fs      = require('fs');
 var path    = require('path');
 var cst     = require('../../constants.js');
@@ -148,7 +147,7 @@ function handleExit(CLI, opts, mode) {
       if (err) {
         console.error(err);
       }
-      vizion.analyze({folder : process.cwd()}, function recur_path(err, meta){
+      require('vizion').analyze({folder : process.cwd()}, function recur_path(err, meta){
         if (!err && meta.revision) {
           var commit_id = util.format('#%s(%s) %s',
                                       meta.branch,
diff --git a/lib/API/Deploy.js b/lib/API/Deploy.js
index 9a19b5163..7cc7845ac 100644
--- a/lib/API/Deploy.js
+++ b/lib/API/Deploy.js
@@ -5,8 +5,6 @@
  */
 
 var fs      = require('fs');
-var Deploy  = require('pm2-deploy');
-
 var cst     = require('../../constants.js');
 var Utility = require('../Utility.js');
 var Common  = require('../Common.js');
@@ -104,7 +102,7 @@ module.exports = function(CLI) {
       json_conf.deploy[env]['post-deploy'] = 'pm2 startOrRestart ' + file + ' --env ' + env;
     }
 
-    Deploy.deployForEnv(json_conf.deploy, env, args, function(err, data) {
+    require('pm2-deploy').deployForEnv(json_conf.deploy, env, args, function(err, data) {
       if (err) {
         Common.printError('Deploy failed');
         return cb ? cb(err) : that.exitCli(cst.ERROR_EXIT);
diff --git a/lib/API/Keymetrics/cli-api.js b/lib/API/Keymetrics/cli-api.js
index 308521439..596c0f964 100644
--- a/lib/API/Keymetrics/cli-api.js
+++ b/lib/API/Keymetrics/cli-api.js
@@ -6,7 +6,6 @@ var async    = require('async');
 var path     = require('path');
 var fs       = require('fs');
 var KMDaemon = require('@pm2/agent/src/InteractorClient');
-var KM       = require('./kmapi.js');
 var Table    = require('cli-table-redemption');
 var open     = require('../../tools/open.js');
 var promptly = require('promptly');
@@ -144,6 +143,7 @@ module.exports = function(CLI) {
    * Open Browser
    */
   function loginPrompt(cb) {
+    var KM = require('./kmapi.js');
     console.log(chalk.bold('Log in to Keymetrics'));
     (function retry() {
       promptly.prompt('Username or Email: ', function(err, username) {
@@ -217,6 +217,8 @@ module.exports = function(CLI) {
    * Open Browser for access to monitoring dashboard
    */
   function registerPrompt() {
+    var KM = require('./kmapi.js');
+
     console.log(chalk.bold('Now registering to Keymetrics'));
     promptly.prompt('Username: ', {
       validator : validateUsername,
diff --git a/lib/API/Keymetrics/kmapi.js b/lib/API/Keymetrics/kmapi.js
index af5d91f8c..6cd75dcff 100644
--- a/lib/API/Keymetrics/kmapi.js
+++ b/lib/API/Keymetrics/kmapi.js
@@ -1,5 +1,4 @@
-var querystring = require('querystring');
-var https = require('https');
+
 var fs = require('fs');
 var needle = require('needle');
 var url = require('url');
@@ -19,6 +18,8 @@ var KM = function() {
  * @return promise
  */
 KM.prototype.loginAndGetAccessToken = function (user_info, cb) {
+  var querystring = require('querystring');
+
   var that = this;
   var URL_AUTH = '/api/oauth/authorize?response_type=token&scope=all&client_id=' +
         that.CLIENT_ID + '&redirect_uri=' + that.CB_URI;
diff --git a/lib/API/Modules/Modularizer.js b/lib/API/Modules/Modularizer.js
index ea1efd320..900afc1e5 100644
--- a/lib/API/Modules/Modularizer.js
+++ b/lib/API/Modules/Modularizer.js
@@ -3,7 +3,6 @@
  * Use of this source code is governed by a license that
  * can be found in the LICENSE file.
  */
-var shelljs       = require('shelljs');
 var path          = require('path');
 var fs            = require('fs');
 var os            = require('os');
@@ -18,7 +17,6 @@ var Common        = require('../../Common');
 var Utility       = require('../../Utility.js');
 var ModularizerV1 = require('./Modularizerv1.js');
 var Modularizer = module.exports = {};
-var mkdirp = require('mkdirp');
 
 var MODULE_CONF_PREFIX = 'module-db-v2';
 
@@ -185,7 +183,7 @@ Modularizer.installModule = function(CLI, module_name, opts, cb) {
   var canonic_module_name = Utility.getCanonicModuleName(module_name);
   var install_path = path.join(cst.DEFAULT_MODULE_PATH, canonic_module_name);
 
-  mkdirp(install_path, function() {
+  require('mkdirp')(install_path, function() {
     process.chdir(os.homedir());
 
     var install_instance = spawn(cst.IS_WINDOWS ? 'npm.cmd' : 'npm', ['install', module_name, '--loglevel=error', '--prefix', install_path ], {
@@ -405,14 +403,14 @@ function uninstallModule(CLI, opts, cb) {
 
       if (module_name != '.') {
         console.log(proc_path);
-        shelljs.rm('-r', proc_path);
+        require('shelljs').rm('-r', proc_path);
       }
 
       return cb(err);
     }
 
     if (module_name != '.') {
-      shelljs.rm('-r', proc_path);
+      require('shelljs').rm('-r', proc_path);
     }
 
     return cb(null, data);
@@ -436,9 +434,9 @@ var Rollback = {
 
     CLI.deleteModule(canonic_module_name, function() {
       // Delete failing module
-      shelljs.rm('-r', module_path);
+      require('shelljs').rm('-r', module_path);
       // Restore working version
-      shelljs.cp('-r', backup_path, module_path);
+      require('shelljs').cp('-r', backup_path, module_path);
 
       var proc_path = path.join(module_path, 'node_modules', canonic_module_name);
       var package_json_path = path.join(proc_path, 'package.json');
@@ -456,7 +454,7 @@ var Rollback = {
     var tmpdir = require('os').tmpdir();
     var canonic_module_name = Utility.getCanonicModuleName(module_name);
     var module_path = path.join(cst.DEFAULT_MODULE_PATH, canonic_module_name);
-    shelljs.cp('-r', module_path, tmpdir);
+    require('shelljs').cp('-r', module_path, tmpdir);
   }
 }
 
@@ -521,13 +519,13 @@ Modularizer.publish = function(cb) {
                       package_json.name,
                       package_json.version);
 
-      shelljs.exec('npm publish', function(code) {
+      require('shelljs').exec('npm publish', function(code) {
         Common.printOut(cst.PREFIX_MSG_MOD + 'Module - %s@%s successfully published',
                         package_json.name,
                         package_json.version);
 
         Common.printOut(cst.PREFIX_MSG_MOD + 'Pushing module on Git');
-        shelljs.exec('git add . ; git commit -m "' + package_json.version + '"; git push origin master', function(code) {
+        require('shelljs').exec('git add . ; git commit -m "' + package_json.version + '"; git push origin master', function(code) {
 
           Common.printOut(cst.PREFIX_MSG_MOD + 'Installable with pm2 install %s', package_json.name);
           return cb(null, package_json);
@@ -550,11 +548,11 @@ Modularizer.generateSample = function(app_name, cb) {
     var cmd3 = 'cd ' + module_name + ' ; npm install';
 
     Common.printOut(cst.PREFIX_MSG_MOD + 'Getting sample app');
-    shelljs.exec(cmd1, function(err) {
+    require('shelljs').exec(cmd1, function(err) {
       if (err) Common.printError(cst.PREFIX_MSG_MOD_ERR + err.message);
-      shelljs.exec(cmd2, function(err) {
+      require('shelljs').exec(cmd2, function(err) {
         console.log('');
-        shelljs.exec(cmd3, function(err) {
+        require('shelljs').exec(cmd3, function(err) {
           console.log('');
           Common.printOut(cst.PREFIX_MSG_MOD + 'Module sample created in folder: ', path.join(process.cwd(), module_name));
           console.log('');
diff --git a/lib/API/Modules/Modularizerv1.js b/lib/API/Modules/Modularizerv1.js
index 00d489917..ad63a5609 100644
--- a/lib/API/Modules/Modularizerv1.js
+++ b/lib/API/Modules/Modularizerv1.js
@@ -3,7 +3,6 @@
  * Use of this source code is governed by a license that
  * can be found in the LICENSE file.
  */
-var shelljs       = require('shelljs');
 var path          = require('path');
 var fs            = require('fs');
 var async         = require('async');
diff --git a/lib/API/Modules/Modules.js b/lib/API/Modules/Modules.js
index 77412b01d..3d9f6f2a3 100644
--- a/lib/API/Modules/Modules.js
+++ b/lib/API/Modules/Modules.js
@@ -11,7 +11,6 @@ var UX          = require('../CliUx');
 var chalk       = require('chalk');
 var async       = require('async');
 
-var shelljs       = require('shelljs');
 var path          = require('path');
 var fs            = require('fs');
 var p             = path;
diff --git a/lib/API/Startup.js b/lib/API/Startup.js
index 356197f64..e27469c1d 100644
--- a/lib/API/Startup.js
+++ b/lib/API/Startup.js
@@ -12,7 +12,6 @@ var exec   = require('child_process').exec;
 var Common = require('../Common.js');
 var cst    = require('../../constants.js');
 var spawn    = require('child_process').spawn;
-var shelljs  = require('shelljs');
 
 module.exports = function(CLI) {
   /**
@@ -47,7 +46,7 @@ module.exports = function(CLI) {
     var init_systems = Object.keys(hash_map);
 
     for (var i = 0; i < init_systems.length; i++) {
-      if (shelljs.which(init_systems[i]) != null) {
+      if (require('shelljs').which(init_systems[i]) != null) {
         break;
       }
     }
@@ -150,7 +149,7 @@ module.exports = function(CLI) {
       ];
     };
 
-    shelljs.exec(commands.join('&& '), function(code, stdout, stderr) {
+    require('shelljs').exec(commands.join('&& '), function(code, stdout, stderr) {
       Common.printOut(stdout);
       Common.printOut(stderr);
       if (code == 0) {
@@ -317,7 +316,7 @@ module.exports = function(CLI) {
 
     async.forEachLimit(commands, 1, function(command, next) {
       Common.printOut(chalk.bold('>>> Executing %s'), command);
-      shelljs.exec(command, function(code, stdout, stderr) {
+      require('shelljs').exec(command, function(code, stdout, stderr) {
         if (code === 0) {
           Common.printOut(chalk.bold('[DONE] '));
           return next();
diff --git a/lib/API/Version.js b/lib/API/Version.js
index 844953174..aefe9352b 100644
--- a/lib/API/Version.js
+++ b/lib/API/Version.js
@@ -3,7 +3,6 @@ var cst     = require('../../constants.js');
 var Common  = require('../Common.js');
 var fs      = require('fs');
 var async   = require('async');
-var vizion  = require('vizion');
 var child   = require('child_process');
 
 var printError = Common.printError;
@@ -33,7 +32,7 @@ module.exports = function(CLI) {
         printOut(cst.PREFIX_MSG + 'No versioning system found for process %s', process_name);
         return cb ? cb({success:false, msg: 'No versioning system found for process'}) : that.exitCli(cst.SUCCESS_EXIT);
       }
-      vizion.update({
+      require('vizion').update({
         folder: proc.pm2_env.versioning.repo_path
       }, function(err, meta) {
         if (err !== null) {
@@ -91,10 +90,10 @@ module.exports = function(CLI) {
 
       var proc = processes[0];
       if (proc.pm2_env.versioning) {
-        vizion.isUpToDate({folder: proc.pm2_env.versioning.repo_path}, function(err, meta) {
+        require('vizion').isUpToDate({folder: proc.pm2_env.versioning.repo_path}, function(err, meta) {
           if (err !== null)
             return cb ? cb({msg:err}) : that.exitCli(cst.ERROR_EXIT);
-          vizion.revertTo(
+          require('vizion').revertTo(
             {revision: commit_id,
              folder: proc.pm2_env.versioning.repo_path},
             function(err2, meta2) {
@@ -153,7 +152,7 @@ module.exports = function(CLI) {
           proc.pm2_env.versioning === null)
         return cb({msg : 'Versioning unknown'});
 
-      vizion.prev({
+      require('vizion').prev({
         folder: proc.pm2_env.versioning.repo_path
       }, function(err, meta) {
         if (err)
@@ -167,7 +166,7 @@ module.exports = function(CLI) {
         getPostUpdateCmds(proc.pm2_env.versioning.repo_path, process_name, function (command_list) {
           execCommands(proc.pm2_env.versioning.repo_path, command_list, function(err, res) {
             if (err !== null) {
-              vizion.next({folder: proc.pm2_env.versioning.repo_path}, function(err2, meta2) {
+              require('vizion').next({folder: proc.pm2_env.versioning.repo_path}, function(err2, meta2) {
                 printError(err);
                 return cb ? cb({msg: meta.output + err}) : that.exitCli(cst.ERROR_EXIT);
               });
@@ -207,7 +206,7 @@ module.exports = function(CLI) {
       // in case user searched by id/pid
       process_name = proc.name;
       if (proc.pm2_env.versioning) {
-        vizion.next({folder: proc.pm2_env.versioning.repo_path}, function(err, meta) {
+        require('vizion').next({folder: proc.pm2_env.versioning.repo_path}, function(err, meta) {
           if (err !== null)
             return cb ? cb({msg:err}) : that.exitCli(cst.ERROR_EXIT);
           if (meta.success === true) {
@@ -215,7 +214,7 @@ module.exports = function(CLI) {
               execCommands(proc.pm2_env.versioning.repo_path, command_list, function(err, res) {
                 if (err !== null)
                 {
-                  vizion.prev({folder: proc.pm2_env.versioning.repo_path}, function(err2, meta2) {
+                  require('vizion').prev({folder: proc.pm2_env.versioning.repo_path}, function(err2, meta2) {
                     printError(err);
                     return cb ? cb({msg:meta.output + err}) : that.exitCli(cst.ERROR_EXIT);
                   });
diff --git a/lib/Client.js b/lib/Client.js
index cf5eb2229..6edb18f77 100644
--- a/lib/Client.js
+++ b/lib/Client.js
@@ -13,8 +13,6 @@ var axon           = require('pm2-axon');
 var util           = require('util');
 var fs             = require('fs');
 var path           = require('path');
-var mkdirp         = require('mkdirp');
-var shelljs        = require('shelljs');
 var pkg            = require('../package.json')
 
 function noop() {}
@@ -131,7 +129,7 @@ Client.prototype.start = function(cb) {
 Client.prototype.initFileStructure = function (opts) {
   if (!fs.existsSync(opts.DEFAULT_LOG_PATH)) {
     try {
-      mkdirp.sync(opts.DEFAULT_LOG_PATH);
+      require('mkdirp').sync(opts.DEFAULT_LOG_PATH);
     } catch (e) {
       console.error(e.stack || e);
     }
@@ -139,7 +137,7 @@ Client.prototype.initFileStructure = function (opts) {
 
   if (!fs.existsSync(opts.DEFAULT_PID_PATH)) {
     try {
-      mkdirp.sync(opts.DEFAULT_PID_PATH);
+      require('mkdirp').sync(opts.DEFAULT_PID_PATH);
     } catch (e) {
       console.error(e.stack || e);
     }
@@ -155,7 +153,7 @@ Client.prototype.initFileStructure = function (opts) {
 
   if (!fs.existsSync(opts.DEFAULT_MODULE_PATH)) {
     try {
-      mkdirp.sync(opts.DEFAULT_MODULE_PATH);
+      require('mkdirp').sync(opts.DEFAULT_MODULE_PATH);
     } catch (e) {
       console.error(e.stack || e);
     }
@@ -243,7 +241,7 @@ Client.prototype.launchDaemon = function(opts, cb) {
 
   var interpreter = 'node';
 
-  if (shelljs.which('node') == null)
+  if (require('shelljs').which('node') == null)
     interpreter = process.execPath;
 
   var child = require('child_process').spawn(interpreter, node_args, {
diff --git a/lib/Common.js b/lib/Common.js
index bae553738..662df66bb 100644
--- a/lib/Common.js
+++ b/lib/Common.js
@@ -12,9 +12,7 @@ var fs        = require('fs');
 var path      = require('path');
 var os        = require('os');
 var util      = require('util');
-var mkdirp    = require('mkdirp');
 var async     = require('async');
-var shelljs   = require('shelljs');
 var chalk     = require('chalk');
 var fclone    = require('fclone');
 var semver    = require('semver');
@@ -23,7 +21,6 @@ var isBinary  = require('./tools/isbinaryfile.js');
 var cst       = require('../constants.js');
 var extItps   = require('./API/interpreter.json');
 var Config    = require('./tools/Config');
-var KMDaemon  = require('@pm2/agent/src/InteractorClient');
 
 var Common = module.exports;
 
@@ -151,7 +148,7 @@ Common.prepareAppConf = function(opts, app) {
   if (!fs.existsSync(app.pm_exec_path)) {
     var ckd;
     // Try resolve command available in $PATH
-    if ((ckd = shelljs.which(app.script))) {
+    if ((ckd = require('shelljs').which(app.script))) {
       if (typeof(ckd) !== 'string')
         ckd = ckd.toString();
       app.pm_exec_path = ckd;
@@ -226,7 +223,7 @@ Common.prepareAppConf = function(opts, app) {
       if (!fs.existsSync(dir)) {
         Common.printError(cst.PREFIX_MSG_WARNING + 'Folder does not exists: ' + dir);
         Common.printOut(cst.PREFIX_MSG + 'Creating folder: ' + dir);
-        mkdirp(dir, function(err) {
+        require('mkdirp')(dir, function(err) {
           if (!err) return;
           Common.printError(cst.PREFIX_MSG_ERR + 'Could not create folder: ' + path.dirname(af));
           throw new Error('Could not create folder');
@@ -368,7 +365,7 @@ var resolveNodeInterpreter = function(app) {
       var nvm_cmd = '. ' + nvm_bin + ' ; nvm install ' + node_version;
 
       Common.printOut(cst.PREFIX_MSG + 'Executing: %s', nvm_cmd);
-      shelljs.exec(nvm_cmd);
+      require('shelljs').exec(nvm_cmd);
     }
 
     Common.printOut(cst.PREFIX_MSG + chalk.green.bold('Setting Node to v%s (path=%s)'),
@@ -411,7 +408,7 @@ Common.sink.resolveInterpreter = function(app) {
     app.exec_interpreter = path.resolve(__dirname, '../node_modules/.bin/coffee');
   }
 
-  if (app.exec_interpreter != 'none' && shelljs.which(app.exec_interpreter) == null) {
+  if (app.exec_interpreter != 'none' && require('shelljs').which(app.exec_interpreter) == null) {
     Common.printError(cst.PREFIX_MSG_ERR + 'Interpreter ' + app.exec_interpreter + ' does not seem to be available');
   }
   return app;
diff --git a/package.json b/package.json
index 7e325cc88..9d6a6970c 100644
--- a/package.json
+++ b/package.json
@@ -158,8 +158,8 @@
     "pm2-runtime": "./bin/pm2-runtime"
   },
   "dependencies": {
-    "@pm2/io": "latest",
     "@pm2/agent": "^0.4.0",
+    "@pm2/io": "latest",
     "async": "^2.6",
     "blessed": "^0.1.81",
     "chalk": "^2.4.1",