diff --git a/tools/az-prom-rules-converter/web-app-example/package-lock.json b/tools/az-prom-rules-converter/web-app-example/package-lock.json
index 038d4c7c6..c0c8ea8d9 100644
--- a/tools/az-prom-rules-converter/web-app-example/package-lock.json
+++ b/tools/az-prom-rules-converter/web-app-example/package-lock.json
@@ -44,8 +44,9 @@
       }
     },
     "node_modules/@adobe/css-tools": {
-      "version": "4.0.1",
-      "license": "MIT"
+      "version": "4.3.1",
+      "resolved": "https://registry.npmjs.org/@adobe/css-tools/-/css-tools-4.3.1.tgz",
+      "integrity": "sha512-/62yikz7NLScCGAAST5SHdnjaDJQBDq0M2muyRTpf2VQhw6StBg2ALiu73zSJQ4fMVLA+0uBhBHAle7Wg+2kSg=="
     },
     "node_modules/@ampproject/remapping": {
       "version": "2.2.0",
@@ -15436,7 +15437,9 @@
   },
   "dependencies": {
     "@adobe/css-tools": {
-      "version": "4.0.1"
+      "version": "4.3.1",
+      "resolved": "https://registry.npmjs.org/@adobe/css-tools/-/css-tools-4.3.1.tgz",
+      "integrity": "sha512-/62yikz7NLScCGAAST5SHdnjaDJQBDq0M2muyRTpf2VQhw6StBg2ALiu73zSJQ4fMVLA+0uBhBHAle7Wg+2kSg=="
     },
     "@ampproject/remapping": {
       "version": "2.2.0",