diff --git a/appmesh-preview/service-model.json b/appmesh-preview/service-model.json
index 2960400..f64028e 100644
--- a/appmesh-preview/service-model.json
+++ b/appmesh-preview/service-model.json
@@ -1128,6 +1128,21 @@
       },
       "documentation": ""
     },
+    "ListenerTls": {
+      "type": "structure",
+      "required": [
+        "certificate",
+        "mode"
+      ],
+      "members": {
+        "certificate": {
+          "shape": "ListenerTlsCertificate"
+        },
+        "mode": {
+          "shape": "ListenerTlsMode"
+        }
+      }
+    },
     "DeleteMeshInput": {
       "type": "structure",
       "required": [
@@ -1610,6 +1625,14 @@
       "min": 0,
       "max": 100
     },
+    "ListenerTlsMode": {
+      "type": "string",
+      "enum": [
+        "DISABLED",
+        "PERMISSIVE",
+        "STRICT"
+      ]
+    },
     "TagValue": {
       "type": "string",
       "min": 0,
@@ -2458,6 +2481,14 @@
       "min": 1,
       "max": 25
     },
+    "ListenerTlsCertificate": {
+      "type": "structure",
+      "members": {
+        "acm": {
+          "shape": "ListenerTlsAcmCertificate"
+        }
+      }
+    },
     "ListVirtualNodesLimit": {
       "type": "integer",
       "box": true,
@@ -2886,6 +2917,9 @@
         "portMapping": {
           "shape": "PortMapping",
           "documentation": "<p>The port mapping information for the listener.</p>"
+        },
+        "tls": {
+          "shape": "ListenerTls"
         }
       },
       "documentation": "<p>An object representing a listener for a virtual node.</p>"
@@ -3601,6 +3635,17 @@
       "min": 1,
       "max": 50
     },
+    "ListenerTlsAcmCertificate": {
+      "type": "structure",
+      "required": [
+        "certificateArn"
+      ],
+      "members": {
+        "certificateArn": {
+          "shape": "Arn"
+        }
+      }
+    },
     "TagKey": {
       "type": "string",
       "min": 1,