diff --git a/examples/express-ex/package.json b/examples/express-ex/package.json
index 74fa523..ddc0439 100644
--- a/examples/express-ex/package.json
+++ b/examples/express-ex/package.json
@@ -15,7 +15,7 @@
   "license": "Apache-2.0",
   "dependencies": {
     "body-parser": "^1.19.0",
-    "cloudevents": "^3.1.0",
+    "cloudevents": "^4.0.0",
     "express": "^4.17.1"
   }
 }