diff --git a/package.json b/package.json
index 7295fc3a3..56c52a3a8 100644
--- a/package.json
+++ b/package.json
@@ -57,7 +57,7 @@
     "babel-preset-es2015": "^6.18.0",
     "babel-preset-react": "^6.16.0",
     "babel-preset-stage-1": "^6.16.0",
-    "clean-css": "*",
+    "clean-css": "^3.0.0",
     "css-loader": "*",
     "eslint": "^3.13.1",
     "eslint-plugin-jsdoc": "*",