diff --git a/packages/optimizer/demo/simple/package-lock.json b/packages/optimizer/demo/simple/package-lock.json
index fd39f5a11..0de2cf97c 100644
--- a/packages/optimizer/demo/simple/package-lock.json
+++ b/packages/optimizer/demo/simple/package-lock.json
@@ -5,41 +5,45 @@
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@@ -296,6 +300,24 @@
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+          "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-0.2.2.tgz",
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+          "requires": {
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+            "entities": "^2.0.0"
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@@ -450,12 +472,13 @@
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+      "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-1.0.1.tgz",
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       "dev": true,
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+        "domhandler": "^3.0.0",
         "entities": "^2.0.0"
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@@ -501,6 +524,16 @@
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+        "dom-serializer": {
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+          "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-0.2.2.tgz",
+          "integrity": "sha512-2/xPb3ORsQ42nHYiSunXkDjPLBaEj/xTwUO4B7XCZQTRk7EBtTOPaygh10YAAh2OI1Qrp6NWfpAhzswj0ydt9g==",
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@@ -519,9 +552,9 @@
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@@ -875,9 +908,9 @@
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@@ -1010,9 +1043,9 @@
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@@ -1681,9 +1714,9 @@
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+      "resolved": "https://registry.npmjs.org/terser/-/terser-4.7.0.tgz",
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diff --git a/packages/optimizer/demo/simple/package.json b/packages/optimizer/demo/simple/package.json
index 6ca3b9c84..5de5fb415 100644
--- a/packages/optimizer/demo/simple/package.json
+++ b/packages/optimizer/demo/simple/package.json
@@ -12,6 +12,6 @@
     "glob": "7.1.6"
   },
   "devDependencies": {
-    "@ampproject/toolbox-optimizer": "2.4.0"
+    "@ampproject/toolbox-optimizer": "2.5.0"
   }
 }