diff --git a/README.md b/README.md
index d86c984..9e93d28 100644
--- a/README.md
+++ b/README.md
@@ -948,7 +948,7 @@ Reveal.initialize({
 	// other options ...
 
 	math: {
-		mathjax: 'http://cdn.mathjax.org/mathjax/latest/MathJax.js',
+		mathjax: 'https://cdn.mathjax.org/mathjax/latest/MathJax.js',
 		config: 'TeX-AMS_HTML-full'  // See http://docs.mathjax.org/en/latest/config-files.html
 	},
 	
diff --git a/package.json b/package.json
index fc70464..7961a95 100644
--- a/package.json
+++ b/package.json
@@ -19,26 +19,26 @@
     "url": "git://github.com/hakimel/reveal.js.git"
   },
   "engines": {
-    "node": "~0.10.0"
+    "node": "~4.1.1"
   },
   "dependencies": {
-    "underscore": "~1.5.1",
-    "express": "~2.5.9",
-    "mustache": "~0.7.2",
-    "socket.io": "~0.9.16"
+    "underscore": "~1.8.3",
+    "express": "~4.13.3",
+    "mustache": "~2.1.3",
+    "socket.io": "~1.3.7"
   },
   "devDependencies": {
-    "grunt-contrib-qunit": "~0.5.2",
-    "grunt-contrib-jshint": "~0.6.4",
-    "grunt-contrib-cssmin": "~0.12.2",
-    "grunt-contrib-uglify": "~0.2.4",
-    "grunt-contrib-watch": "~0.5.3",
-    "grunt-sass": "~0.14.0",
-    "grunt-contrib-connect": "~0.8.0",
-    "grunt-autoprefixer": "~1.0.1",
-    "grunt-zip": "~0.7.0",
-    "grunt": "~0.4.0",
-    "node-sass": "~0.9.3"
+    "grunt-contrib-qunit": "~0.7.0",
+    "grunt-contrib-jshint": "~0.11.3",
+    "grunt-contrib-cssmin": "~0.14.0",
+    "grunt-contrib-uglify": "~0.9.2",
+    "grunt-contrib-watch": "~0.6.1",
+    "grunt-sass": "~1.1.0-beta",
+    "grunt-contrib-connect": "~0.11.2",
+    "grunt-autoprefixer": "~3.0.3",
+    "grunt-zip": "~0.17.1",
+    "grunt": "~0.4.5",
+    "node-sass": "~3.3.3"
   },
   
   "license": "MIT"