diff --git a/src/node/handler/PadMessageHandler.js b/src/node/handler/PadMessageHandler.js
index 598b2df54..bc8f5d629 100644
--- a/src/node/handler/PadMessageHandler.js
+++ b/src/node/handler/PadMessageHandler.js
@@ -838,10 +838,10 @@ exports.updatePadClients = function(pad, callback)
 
               client.json.send(wireMsg);
             }
-
-            sessioninfos[sid].time = currentTime;
-            sessioninfos[sid].rev = r;
-
+            if(sessioninfos[sid]){
+              sessioninfos[sid].time = currentTime;
+              sessioninfos[sid].rev = r;
+            }
             callback(null);
           }
         ], callback);
diff --git a/src/node/utils/Minify.js b/src/node/utils/Minify.js
index 58d08b30e..132d63dae 100644
--- a/src/node/utils/Minify.js
+++ b/src/node/utils/Minify.js
@@ -23,12 +23,12 @@ var ERR = require("async-stacktrace");
 var settings = require('./Settings');
 var async = require('async');
 var fs = require('fs');
-var cleanCSS = require('clean-css');
+var CleanCSS = require('clean-css');
 var jsp = require("uglify-js").parser;
 var pro = require("uglify-js").uglify;
 var path = require('path');
 var plugins = require("ep_etherpad-lite/static/js/pluginfw/plugins");
-var RequireKernel = require('require-kernel');
+var RequireKernel = require('etherpad-require-kernel');
 var urlutil = require('url');
 
 var ROOT_DIR = path.normalize(__dirname + "/../../static/");
@@ -411,7 +411,8 @@ function compressJS(values)
 function compressCSS(values)
 {
   var complete = values.join("\n");
-  return cleanCSS.process(complete);
+  var cleanCSS = new CleanCSS({}).minify(complete);
+  return cleanCSS;
 }
 
 exports.minify = minify;
diff --git a/src/package.json b/src/package.json
index f173b94ec..3d5f5e24e 100644
--- a/src/package.json
+++ b/src/package.json
@@ -12,35 +12,35 @@
                      ],
   "dependencies"   : {
                       "yajsml"                  : "1.1.6",
-                      "request"                 : "2.9.100",
-                      "require-kernel"          : "1.0.5",
+                      "request"                 : ">=2.48.0",
+                      "etherpad-require-kernel" : ">=1.0.7",
                       "resolve"                 : ">=1.0.0",
                       "socket.io"               : ">=1.2.0",
                       "ueberDB"                 : ">=0.2.9",
                       "express"                 : ">3.1.0 <3.9.0",
-                      "async"                   : "0.1.x",
+                      "async"                   : ">=0.9.0",
                       "connect"                 : "2.7.x",
-                      "clean-css"               : "0.3.2",
-                      "uglify-js"               : "1.2.5",
-                      "formidable"              : "1.0.9",
-                      "log4js"                  : "0.6.6",
+                      "clean-css"               : ">=2.0.0",
+                      "uglify-js"               : ">=2.4.15",
+                      "formidable"              : ">=1.0.15",
+                      "log4js"                  : ">=0.6.21",
                       "nodemailer"              : "0.3.x",
-                      "cheerio"                 : "0.18.0",
-                      "async-stacktrace"        : "0.0.2",
-                      "npm"                     : "1.4.x",
-                      "ejs"                     : "0.6.1",
-                      "graceful-fs"             : "1.1.5",
-                      "slide"                   : "1.1.3",
-                      "semver"                  : ">2.3.0",
+                      "cheerio"                 : ">=0.18.0",
+                      "async-stacktrace"        : ">=0.0.2",
+                      "npm"                     : ">=2.1.x",
+                      "ejs"                     : ">=1.0.0",
+                      "graceful-fs"             : ">=3.0.4",
+                      "slide"                   : ">=1.1.6",
+                      "semver"                  : ">=2.3.0",
                       "security"                : "1.0.0",
-                      "tinycon"                 : "0.0.1",
+                      "tinycon"                 : ">=0.0.1",
                       "underscore"              : "1.5.1",
-                      "unorm"                   : "1.0.0",
-                      "languages4translatewiki" : "0.1.3",
+                      "unorm"                   : ">=1.3.3",
+                      "languages4translatewiki" : ">=0.1.3",
                       "swagger-node-express"    : ">=2.1.0",
                       "channels"                : "0.0.x",
-                      "jsonminify"              : "0.2.2",
-                      "measured"                : "0.1.3",
+                      "jsonminify"              : ">=0.2.3",
+                      "measured"                : ">=0.1.6",
                       "mocha"                   : ">=2.0.1",
                       "supertest"               : ">=0.15.0"
                      },