diff --git a/package-lock.json b/package-lock.json
index 2977c2e..414ba71 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,7 +12,7 @@
         "packages/*"
       ],
       "devDependencies": {
-        "@webref/css": "^6.12.15",
+        "@webref/css": "^6.13.0",
         "aria-attributes": "^2.0.1",
         "c8": "^10.1.2",
         "html-element-attributes": "^3.4.0",
@@ -301,9 +301,9 @@
       "dev": true
     },
     "node_modules/@webref/css": {
-      "version": "6.12.15",
-      "resolved": "https://registry.npmjs.org/@webref/css/-/css-6.12.15.tgz",
-      "integrity": "sha512-OMq64wmRzvxQL+2ohfHIZ4mFY4HXzM3UrcXQTTfVU6h1T9luHyjoMqe4vO7vTw31WbvcPLU3dt8LC/OAz82mfg==",
+      "version": "6.13.0",
+      "resolved": "https://registry.npmjs.org/@webref/css/-/css-6.13.0.tgz",
+      "integrity": "sha512-H8jR30FwjBjPLJfs3nT9Bl0CgZVv6HGyKr3ABTozIOXwAB1iU/f2KU3xhU2WSxufAU4zLKwqgL04RxsCayKSSA==",
       "dev": true,
       "peerDependencies": {
         "css-tree": "^2.3.1"
diff --git a/package.json b/package.json
index 2d1764f..d10977f 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
     "packages/*"
   ],
   "devDependencies": {
-    "@webref/css": "^6.12.15",
+    "@webref/css": "^6.13.0",
     "aria-attributes": "^2.0.1",
     "c8": "^10.1.2",
     "html-element-attributes": "^3.4.0",