diff --git a/themes/typing/package.json b/themes/typing/package.json
index 46f7748..8d8803c 100644
--- a/themes/typing/package.json
+++ b/themes/typing/package.json
@@ -23,7 +23,7 @@
     "typo.css": "^2.1.2"
   },
   "devDependencies": {
-    "cssnano": "^3.7.3",
+    "cssnano": "^4.0.0",
     "postcss-cli": "^2.5.2",
     "postcss-import": "^8.1.2",
     "precss": "^1.4.0"