diff --git a/HISTORY.md b/HISTORY.md
index 9e9be31..0b6d09c 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -3,6 +3,11 @@
 https://github.com/josdejong/jsoneditor
 
 
+## not yet released, version 5.4.0
+
+- Upgraded all dependencies.
+
+
 ## 2016-04-06, version 5.3.0
 
 - Implemented support for sorting object keys naturally. Thanks @edufelipe.
diff --git a/gulpfile.js b/gulpfile.js
index ab1bcc7..3e3db46 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -2,7 +2,7 @@ var fs = require('fs');
 var gulp = require('gulp');
 var gutil = require('gulp-util');
 var concatCss = require('gulp-concat-css');
-var minifyCSS = require('gulp-minify-css');
+var minifyCSS = require('gulp-clean-css');
 var shell = require('gulp-shell');
 var mkdirp = require('mkdirp');
 var webpack = require('webpack');
diff --git a/package.json b/package.json
index 3cb4a6c..67c9ae1 100644
--- a/package.json
+++ b/package.json
@@ -23,20 +23,20 @@
     "test": "mocha test"
   },
   "dependencies": {
-    "ajv": "3.4.0",
-    "brace": "0.7.0",
+    "ajv": "3.8.8",
+    "brace": "0.8.0",
     "javascript-natural-sort": "0.7.1"
   },
   "devDependencies": {
-    "gulp": "3.9.0",
+    "gulp": "3.9.1",
+    "gulp-clean-css": "2.0.5",
     "gulp-concat-css": "2.2.0",
-    "gulp-minify-css": "1.2.3",
-    "gulp-shell": "0.5.1",
+    "gulp-shell": "0.5.2",
     "gulp-util": "3.0.7",
     "json-loader": "0.5.4",
     "mkdirp": "0.5.1",
-    "mocha": "2.3.4",
-    "uglify-js": "2.6.1",
-    "webpack": "1.12.11"
+    "mocha": "2.4.5",
+    "uglify-js": "2.6.2",
+    "webpack": "1.12.14"
   }
 }