diff --git a/package.json b/package.json
index eec739c..050a0a1 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
   "dependencies": {
     "browserify": "^13.0.0",
     "camelcase-keys": "^2.1.0",
-    "cssmin": "^0.4.3",
+    "csso": "^1.8.0",
     "glob": "^7.0.3",
     "handlebars": "^4.0.5",
     "html-minifier": "^1.3.1",
diff --git a/scripts/build-frontend.js b/scripts/build-frontend.js
index 2fcfb84..092a358 100644
--- a/scripts/build-frontend.js
+++ b/scripts/build-frontend.js
@@ -65,7 +65,7 @@ function bundleHtml(config) {
 }
 
 function bundleCss() {
-    const minify = require('cssmin');
+    const minify = require('csso').minify;
     glob('static/css/**/*.css', {}, (er, files) => {
         let css = '';
         for (const file of files) {