diff --git a/src/docs/package.json b/src/docs/package.json
index 2a9f9b546..6423465dc 100644
--- a/src/docs/package.json
+++ b/src/docs/package.json
@@ -24,6 +24,7 @@
     "html-entities": "^2.3.3",
     "jquery": "^4.0.0",
     "js-yaml": "^4.1.0",
+    "cssstyle": "^4.2.1",
     "jsdom": "^26.1.0",
     "marked": "^11.1.1"
   },