diff --git a/lib/jambonz/specs.json b/lib/jambonz/specs.json
index 81a0d4f..488e523 100644
--- a/lib/jambonz/specs.json
+++ b/lib/jambonz/specs.json
@@ -460,8 +460,13 @@
     ]
   },
   "vad": {
-    "enable": "boolean",
-    "voiceMs": "number",
-    "mode": "number"
+    "properties": {
+      "enable": "boolean",
+      "voiceMs": "number",
+      "mode": "number"  
+    },
+    "required": [
+      "enable"
+    ]
   }
 }
diff --git a/package-lock.json b/package-lock.json
index 47f565c..37b205e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@jambonz/node-client",
-  "version": "0.2.22",
+  "version": "0.2.23",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@jambonz/node-client",
-      "version": "0.2.22",
+      "version": "0.2.23",
       "license": "MIT",
       "dependencies": {
         "bent": "^7.3.12",
diff --git a/package.json b/package.json
index ebeb789..1be3d9a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@jambonz/node-client",
-  "version": "0.2.22",
+  "version": "0.2.23",
   "description": "",
   "main": "lib/index.js",
   "scripts": {