diff --git a/core/http/react-ui/package-lock.json b/core/http/react-ui/package-lock.json
index 242ae9df6..1fe6bd04e 100644
--- a/core/http/react-ui/package-lock.json
+++ b/core/http/react-ui/package-lock.json
@@ -20,7 +20,7 @@
         "@lezer/highlight": "^1.2.1",
         "@modelcontextprotocol/ext-apps": "^1.2.2",
         "@modelcontextprotocol/sdk": "^1.25.1",
-        "dompurify": "^3.2.5",
+        "dompurify": "^3.4.0",
         "highlight.js": "^11.11.1",
         "marked": "^15.0.7",
         "react": "^19.1.0",
@@ -2013,12 +2013,10 @@
       }
     },
     "node_modules/dompurify": {
-      "version": "3.3.2",
-      "resolved": "https://registry.npmjs.org/dompurify/-/dompurify-3.3.2.tgz",
-      "integrity": "sha512-6obghkliLdmKa56xdbLOpUZ43pAR6xFy1uOrxBaIDjT+yaRuuybLjGS9eVBoSR/UPU5fq3OXClEHLJNGvbxKpQ==",
-      "engines": {
-        "node": ">=20"
-      },
+      "version": "3.4.0",
+      "resolved": "https://registry.npmjs.org/dompurify/-/dompurify-3.4.0.tgz",
+      "integrity": "sha512-nolgK9JcaUXMSmW+j1yaSvaEaoXYHwWyGJlkoCTghc97KgGDDSnpoU/PlEnw63Ah+TGKFOyY+X5LnxaWbCSfXg==",
+      "license": "(MPL-2.0 OR Apache-2.0)",
       "optionalDependencies": {
         "@types/trusted-types": "^2.0.7"
       }
diff --git a/core/http/react-ui/package.json b/core/http/react-ui/package.json
index c8f29d3fe..6abb21c95 100644
--- a/core/http/react-ui/package.json
+++ b/core/http/react-ui/package.json
@@ -17,7 +17,7 @@
     "react-router-dom": "^7.6.1",
     "highlight.js": "^11.11.1",
     "marked": "^15.0.7",
-    "dompurify": "^3.2.5",
+    "dompurify": "^3.4.0",
     "@fortawesome/fontawesome-free": "^6.7.2",
     "@modelcontextprotocol/sdk": "^1.25.1",
     "@modelcontextprotocol/ext-apps": "^1.2.2",