diff --git a/package-lock.json b/package-lock.json
index 45b12625fe61..4385c2484a59 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -20,7 +20,7 @@
         "css-tree": "3.1.0",
         "flags": "0.2.2",
         "mocha": "11.0.1",
-        "reffy": "18.1.0",
+        "reffy": "18.1.1",
         "rimraf": "6.0.1",
         "strudy": "^3.0.2",
         "webidl2": "24.4.1"
@@ -2756,9 +2756,9 @@
       }
     },
     "node_modules/reffy": {
-      "version": "18.1.0",
-      "resolved": "https://registry.npmjs.org/reffy/-/reffy-18.1.0.tgz",
-      "integrity": "sha512-ZxvGn8GKVzFBjkiaCfeT8JuBrmyj03CVJNQ3rP5/uPGJrMgcHvwOm10j0SPQ0lVLL8A5MQcV8loWdRjkGrHWmw==",
+      "version": "18.1.1",
+      "resolved": "https://registry.npmjs.org/reffy/-/reffy-18.1.1.tgz",
+      "integrity": "sha512-gRDaMOK3bjrOgmY2AcyGI1s6RhC6dccqyij+gF475ECri9u+uGZ0s44QJoqtysBZIaglae6cwHeOayq+f4JZrw==",
       "dev": true,
       "dependencies": {
         "ajv": "8.17.1",
@@ -3808,7 +3808,7 @@
     },
     "packages/css": {
       "name": "@webref/css",
-      "version": "6.17.7",
+      "version": "6.18.0",
       "dev": true,
       "license": "MIT",
       "peerDependencies": {
@@ -3829,7 +3829,7 @@
     },
     "packages/idl": {
       "name": "@webref/idl",
-      "version": "3.57.1",
+      "version": "3.58.0",
       "dev": true,
       "license": "MIT",
       "peerDependencies": {
@@ -5867,9 +5867,9 @@
       }
     },
     "reffy": {
-      "version": "18.1.0",
-      "resolved": "https://registry.npmjs.org/reffy/-/reffy-18.1.0.tgz",
-      "integrity": "sha512-ZxvGn8GKVzFBjkiaCfeT8JuBrmyj03CVJNQ3rP5/uPGJrMgcHvwOm10j0SPQ0lVLL8A5MQcV8loWdRjkGrHWmw==",
+      "version": "18.1.1",
+      "resolved": "https://registry.npmjs.org/reffy/-/reffy-18.1.1.tgz",
+      "integrity": "sha512-gRDaMOK3bjrOgmY2AcyGI1s6RhC6dccqyij+gF475ECri9u+uGZ0s44QJoqtysBZIaglae6cwHeOayq+f4JZrw==",
       "dev": true,
       "requires": {
         "ajv": "8.17.1",
diff --git a/package.json b/package.json
index 7ef98fe8551b..529485b30cba 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
     "css-tree": "3.1.0",
     "flags": "0.2.2",
     "mocha": "11.0.1",
-    "reffy": "18.1.0",
+    "reffy": "18.1.1",
     "rimraf": "6.0.1",
     "strudy": "^3.0.2",
     "webidl2": "24.4.1"