diff --git a/package.json b/package.json
index 2d84a27..55bc573 100644
--- a/package.json
+++ b/package.json
@@ -68,7 +68,7 @@
         "@tryghost/shared-theme-assets": "2.0.2",
         "autoprefixer": "10.4.14",
         "beeper": "2.1.0",
-        "cssnano": "5.1.15",
+        "cssnano": "6.0.0",
         "gscan": "4.36.1",
         "gulp": "4.0.2",
         "gulp-concat": "2.6.1",