diff --git a/src/sx/package.json b/src/sx/package.json
index 385a864fe3..de6a4385ec 100644
--- a/src/sx/package.json
+++ b/src/sx/package.json
@@ -19,7 +19,7 @@
     "@adeira/murmur-hash": "^2.0.1",
     "@babel/runtime": "^7.26.0",
     "change-case": "^4.1.2",
-    "css-tree": "^2.3.1",
+    "css-tree": "^3.1.0",
     "fast-levenshtein": "^3.0.0",
     "json-stable-stringify": "^1.1.1",
     "mdn-data": "^2.8.0",
diff --git a/yarn.lock b/yarn.lock
index 11a3b601c6..e603003589 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -470,7 +470,7 @@ __metadata:
     "@testing-library/jest-dom": "npm:^6.6.3"
     "@testing-library/react": "npm:^15.0.7"
     change-case: "npm:^4.1.2"
-    css-tree: "npm:^2.3.1"
+    css-tree: "npm:^3.1.0"
     fast-levenshtein: "npm:^3.0.0"
     json-stable-stringify: "npm:^1.1.1"
     mdn-data: "npm:^2.8.0"
@@ -8674,6 +8674,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"css-tree@npm:^3.1.0":
+  version: 3.1.0
+  resolution: "css-tree@npm:3.1.0"
+  dependencies:
+    mdn-data: "npm:2.12.2"
+    source-map-js: "npm:^1.0.1"
+  checksum: 10c0/b5715852c2f397c715ca00d56ec53fc83ea596295ae112eb1ba6a1bda3b31086380e596b1d8c4b980fe6da09e7d0fc99c64d5bb7313030dd0fba9c1415f30979
+  languageName: node
+  linkType: hard
+
 "css-tree@npm:~2.2.0":
   version: 2.2.1
   resolution: "css-tree@npm:2.2.1"
@@ -14963,10 +14973,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"mdn-data@npm:^2.8.0":
-  version: 2.8.0
-  resolution: "mdn-data@npm:2.8.0"
-  checksum: 10c0/8e7f2ba8df3665049dc8268d51a85f5f2acd218817722e41e8b407fb272471d06e4a95a063e3c08a09b883d0934fbf18f223b6951dea515780f47eb6b684dc54
+"mdn-data@npm:2.12.2, mdn-data@npm:^2.8.0":
+  version: 2.12.2
+  resolution: "mdn-data@npm:2.12.2"
+  checksum: 10c0/b22443b71d70f72ccc3c6ba1608035431a8fc18c3c8fc53523f06d20e05c2ac10f9b53092759a2ca85cf02f0d37036f310b581ce03e7b99ac74d388ef8152ade
   languageName: node
   linkType: hard