diff --git a/apps/api/package.json b/apps/api/package.json
index d4481759..e914b5bc 100644
--- a/apps/api/package.json
+++ b/apps/api/package.json
@@ -57,6 +57,7 @@
     "@sentry/profiling-node": "^7.110.1",
     "ai": "^6.0.158",
     "axios": "^1.4.0",
+    "css-tree": "^3.2.1",
     "dotenv": "^16.3.1",
     "drizzle-orm": "^0.44.7",
     "hono": "^4.11.3",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 992e0d40..0d585ef8 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -114,6 +114,9 @@ importers:
       axios:
         specifier: ^1.4.0
         version: 1.13.2
+      css-tree:
+        specifier: ^3.2.1
+        version: 3.2.1
       dotenv:
         specifier: ^16.3.1
         version: 16.6.1