diff --git a/package-lock.json b/package-lock.json
index f9345b6..d390c1b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -788,11 +788,11 @@
       }
     },
     "css-tree": {
-      "version": "1.0.0-alpha.30",
-      "resolved": "https://registry.npmjs.org/css-tree/-/css-tree-1.0.0-alpha.30.tgz",
-      "integrity": "sha512-/yR+59CTMG5yJ3yG/sLgwiz8kBqNZzkyp6T7qyg3DPTD2IJ7/bs8BRDOQfRTjvXpP2cPB8Z7AY/31597iMY4+Q==",
+      "version": "1.0.0-alpha.31",
+      "resolved": "https://registry.npmjs.org/css-tree/-/css-tree-1.0.0-alpha.31.tgz",
+      "integrity": "sha512-FSOxWGZzajWgLMtxfLfTtCTjbCyn4nq0rbZyNZANu3GBZuUbqZAe6O/wFV5o5BMp3aBtHNYRsy+ABWD6GfB7AA==",
       "requires": {
-        "mdn-data": "~2.0.3",
+        "mdn-data": "2.0.4",
         "source-map": "^0.5.3"
       }
     },
@@ -2117,9 +2117,9 @@
       }
     },
     "mdn-data": {
-      "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/mdn-data/-/mdn-data-2.0.3.tgz",
-      "integrity": "sha512-DCfx3pMW1vNlxApB8XrHAFvhUcvVAdmu3BU9r4tF6eWwv9Eg+gvQpdr2EGaEWsrPlk+jZSkEKxfdezo6d2pWYg=="
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/mdn-data/-/mdn-data-2.0.4.tgz",
+      "integrity": "sha512-iV3XNKw06j5Q7mi6h+9vbx23Tv7JkjEVgKHW4pimwyDGWm0OIQntJJ+u1C6mg6mK1EaTv42XQ7w76yuzH7M2cA=="
     },
     "meow": {
       "version": "5.0.0",
diff --git a/package.json b/package.json
index a530c5e..7ddd856 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
     "travis": "npm run test"
   },
   "dependencies": {
-    "css-tree": "1.0.0-alpha.30"
+    "css-tree": "1.0.0-alpha.31"
   },
   "peerDependencies": {
     "stylelint": ">=7.0.0 <11.0.0"