diff --git a/lib/usage.js b/lib/usage.js
index e8b3054..a8fd1aa 100644
--- a/lib/usage.js
+++ b/lib/usage.js
@@ -5,7 +5,7 @@ module.exports = {
         console.log("");
         console.log("Clean CSS Plugin");
         console.log("specify plugin with --clean-css");
-        console.log("To pass an option to clean css, we use similar CLI arguments as from https://github.com/GoalSmashers/clean-css");
+        console.log("To pass an option to clean css, we use similar CLI arguments as from https://github.com/jakubpawlowicz/clean-css");
         console.log("The exception is advanced and rebase - we turn these off by default so use advanced/rebase to turn it back on again.");
         console.log("--clean-css=\"-s1 --advanced --rebase\"");
         console.log("The options do not require dashes, so this is also equivalent");
diff --git a/package.json b/package.json
index 92fb379..6132ac7 100644
--- a/package.json
+++ b/package.json
@@ -20,7 +20,7 @@
     "node": ">=0.10"
   },
   "dependencies": {
-    "clean-css": "^3.0.1"
+    "clean-css": "^4.0.7"
   },
   "keywords": [
     "less plugins",