diff --git a/package.json b/package.json
index dbf64bd..9090e4b 100644
--- a/package.json
+++ b/package.json
@@ -7,8 +7,8 @@
     "url": "https://github.com/alanorth/hugo-theme-bootstrap4-blog.git"
   },
   "scripts": {
-    "build:css": "sass --style expanded source/scss/style.scss assets/css/style.css.tmp && cleancss --level 1 assets/css/style.css.tmp -o assets/css/style.css",
-    "build:rtlcss": "rtlcss -s assets/css/style.css.tmp assets/css/style.rtl.css.tmp && cleancss --level 1 assets/css/style.rtl.css.tmp -o assets/css/style.rtl.css",
+    "build:css": "sass --style expanded source/scss/style.scss assets/css/style.css.tmp && cleancss -O1 assets/css/style.css.tmp -o assets/css/style.css",
+    "build:rtlcss": "rtlcss -s assets/css/style.css.tmp assets/css/style.rtl.css.tmp && cleancss -O1 assets/css/style.rtl.css.tmp -o assets/css/style.rtl.css",
     "build:cookieconsent": "cp node_modules/@chiiya/haven/dist/haven.umd.min.js assets/js",
     "build:js": "webpack",
     "build": "npm run build:css && npm run build:rtlcss && npm run build:js && npm run build:cookieconsent && npm run clean",