diff --git a/packages/optimizer/demo/markdown/package-lock.json b/packages/optimizer/demo/markdown/package-lock.json
index f1a742126..0c9d9237d 100644
--- a/packages/optimizer/demo/markdown/package-lock.json
+++ b/packages/optimizer/demo/markdown/package-lock.json
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diff --git a/packages/optimizer/demo/markdown/package.json b/packages/optimizer/demo/markdown/package.json
index 340580c67..10fe527d3 100644
--- a/packages/optimizer/demo/markdown/package.json
+++ b/packages/optimizer/demo/markdown/package.json
@@ -5,6 +5,6 @@
   "description": "AMP Optimizer supports converting Markdown to AMPHTML.",
   "devDependencies": {
     "markdown-it": "11.0.0",
-    "probe-image-size": "5.0.0"
+    "probe-image-size": "7.2.3"
   }
 }