diff --git a/Chapter09/json-pollution/fixed-server.js b/Chapter09/json-pollution/fixed-server.js
index 4e81774..3edddaf 100644
--- a/Chapter09/json-pollution/fixed-server.js
+++ b/Chapter09/json-pollution/fixed-server.js
@@ -48,5 +48,6 @@ greeting = (req, res) => {
   });
 };
 
-server.listen(3000);
-
+server.listen(3000, () => {
+  console.log("Server listening on port 3000");
+});
diff --git a/Chapter09/json-pollution/package-lock.json b/Chapter09/json-pollution/package-lock.json
index 216f534..08d516b 100644
--- a/Chapter09/json-pollution/package-lock.json
+++ b/Chapter09/json-pollution/package-lock.json
@@ -7,10 +7,10 @@
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.4.tgz",
       "integrity": "sha512-eienB2c9qVQs2KWexhkrdMLVDoIQCz5KSeLxwg9Lzk4DOfBtIK9PQwwufcsn1jjGuf9WZmqPMbGxOzfcuphJCQ==",
       "requires": {
-        "fast-deep-equal": "3.1.3",
-        "fast-json-stable-stringify": "2.1.0",
-        "json-schema-traverse": "0.4.1",
-        "uri-js": "4.4.0"
+        "fast-deep-equal": "^3.1.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
       }
     },
     "fast-deep-equal": {
@@ -38,7 +38,7 @@
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.0.tgz",
       "integrity": "sha512-B0yRTzYdUCCn9n+F4+Gh4yIDtMQcaJsmYBDsTSG8g/OejKBodLQ2IHfN3bM7jUsRXndopT7OIXWdYqc1fjmV6g==",
       "requires": {
-        "punycode": "2.1.1"
+        "punycode": "^2.1.0"
       }
     }
   }
diff --git a/Chapter09/json-pollution/server.js b/Chapter09/json-pollution/server.js
index 03dea74..7f37fe0 100644
--- a/Chapter09/json-pollution/server.js
+++ b/Chapter09/json-pollution/server.js
@@ -30,5 +30,6 @@ greeting = (req, res) => {
   });
 };
 
-server.listen(3000);
-
+server.listen(3000, () => {
+  console.log("Server listening on port 3000");
+});