diff --git a/package-lock.json b/package-lock.json
index d4ae3a973242..53b6ee2b31d7 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": "18.2.1",
+        "reffy": "18.3.0",
         "rimraf": "6.0.1",
         "strudy": "^3.1.1",
         "webidl2": "24.4.1"
@@ -2558,18 +2558,19 @@
       }
     },
     "node_modules/reffy": {
-      "version": "18.2.1",
-      "resolved": "https://registry.npmjs.org/reffy/-/reffy-18.2.1.tgz",
-      "integrity": "sha512-t0sJWOJf/mijRdTB3rEPL0nXlR4pWHFezezsGDgqMOLGx1lytdexeulcEEW/sHWsTkBGj9i6ET6QtWRXpypn8Q==",
+      "version": "18.3.0",
+      "resolved": "https://registry.npmjs.org/reffy/-/reffy-18.3.0.tgz",
+      "integrity": "sha512-tlmN43n9Xg+elVnzZD77EWidfF/FWPNih4JDLojUZ3JO41Em2vX4KxYqesORHEuGjJ0d0p40NRCTQktnzEPlHw==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
         "ajv": "8.17.1",
         "ajv-formats": "3.0.1",
-        "commander": "13.0.0",
+        "commander": "13.1.0",
         "fetch-filecache-for-crawling": "5.1.1",
         "puppeteer": "24.1.0",
         "semver": "^7.3.5",
-        "web-specs": "3.34.0",
+        "web-specs": "3.35.0",
         "webidl2": "24.4.1"
       },
       "bin": {
@@ -2580,10 +2581,11 @@
       }
     },
     "node_modules/reffy/node_modules/commander": {
-      "version": "13.0.0",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-13.0.0.tgz",
-      "integrity": "sha512-oPYleIY8wmTVzkvQq10AEok6YcTC4sRUBl8F9gVuwchGVUCTbl/vhLTaQqutuuySYOsu8YTgV+OxKc/8Yvx+mQ==",
+      "version": "13.1.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-13.1.0.tgz",
+      "integrity": "sha512-/rFeCpNJQbhSZjGVwO9RFV3xPqbnERS8MmIQzCtD/zl6gpJuV/bMLuN92oG3F7d8oDEHHRrujSXNUr8fpjntKw==",
       "dev": true,
+      "license": "MIT",
       "engines": {
         "node": ">=18"
       }
@@ -3268,10 +3270,11 @@
       }
     },
     "node_modules/web-specs": {
-      "version": "3.34.0",
-      "resolved": "https://registry.npmjs.org/web-specs/-/web-specs-3.34.0.tgz",
-      "integrity": "sha512-jn3HkJVFYuBK7eeGCZLRoCeejx+W0MsNps3lfwJwaaTP2JF83AvLE+xERRQyzyTJJfFCPthp7Fvdas7KK3J/Lw==",
-      "dev": true
+      "version": "3.35.0",
+      "resolved": "https://registry.npmjs.org/web-specs/-/web-specs-3.35.0.tgz",
+      "integrity": "sha512-C0Fs9B39exvcWvkf46jBumUoC4Ki4JMkcDh3bebTNKKksmo0j0tJ1V0Indkm4JH+Lc2PD+0ROrV2TMoYYHpjvA==",
+      "dev": true,
+      "license": "CC0-1.0"
     },
     "node_modules/webidl-conversions": {
       "version": "7.0.0",
@@ -5414,25 +5417,25 @@
       }
     },
     "reffy": {
-      "version": "18.2.1",
-      "resolved": "https://registry.npmjs.org/reffy/-/reffy-18.2.1.tgz",
-      "integrity": "sha512-t0sJWOJf/mijRdTB3rEPL0nXlR4pWHFezezsGDgqMOLGx1lytdexeulcEEW/sHWsTkBGj9i6ET6QtWRXpypn8Q==",
+      "version": "18.3.0",
+      "resolved": "https://registry.npmjs.org/reffy/-/reffy-18.3.0.tgz",
+      "integrity": "sha512-tlmN43n9Xg+elVnzZD77EWidfF/FWPNih4JDLojUZ3JO41Em2vX4KxYqesORHEuGjJ0d0p40NRCTQktnzEPlHw==",
       "dev": true,
       "requires": {
         "ajv": "8.17.1",
         "ajv-formats": "3.0.1",
-        "commander": "13.0.0",
+        "commander": "13.1.0",
         "fetch-filecache-for-crawling": "5.1.1",
         "puppeteer": "24.1.0",
         "semver": "^7.3.5",
-        "web-specs": "3.34.0",
+        "web-specs": "3.35.0",
         "webidl2": "24.4.1"
       },
       "dependencies": {
         "commander": {
-          "version": "13.0.0",
-          "resolved": "https://registry.npmjs.org/commander/-/commander-13.0.0.tgz",
-          "integrity": "sha512-oPYleIY8wmTVzkvQq10AEok6YcTC4sRUBl8F9gVuwchGVUCTbl/vhLTaQqutuuySYOsu8YTgV+OxKc/8Yvx+mQ==",
+          "version": "13.1.0",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-13.1.0.tgz",
+          "integrity": "sha512-/rFeCpNJQbhSZjGVwO9RFV3xPqbnERS8MmIQzCtD/zl6gpJuV/bMLuN92oG3F7d8oDEHHRrujSXNUr8fpjntKw==",
           "dev": true
         }
       }
@@ -5928,9 +5931,9 @@
       }
     },
     "web-specs": {
-      "version": "3.34.0",
-      "resolved": "https://registry.npmjs.org/web-specs/-/web-specs-3.34.0.tgz",
-      "integrity": "sha512-jn3HkJVFYuBK7eeGCZLRoCeejx+W0MsNps3lfwJwaaTP2JF83AvLE+xERRQyzyTJJfFCPthp7Fvdas7KK3J/Lw==",
+      "version": "3.35.0",
+      "resolved": "https://registry.npmjs.org/web-specs/-/web-specs-3.35.0.tgz",
+      "integrity": "sha512-C0Fs9B39exvcWvkf46jBumUoC4Ki4JMkcDh3bebTNKKksmo0j0tJ1V0Indkm4JH+Lc2PD+0ROrV2TMoYYHpjvA==",
       "dev": true
     },
     "webidl-conversions": {
diff --git a/package.json b/package.json
index b050c018787d..6c57f22114e9 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": "18.2.1",
+    "reffy": "18.3.0",
     "rimraf": "6.0.1",
     "strudy": "^3.1.1",
     "webidl2": "24.4.1"